Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, 2014-12-29 at 23:32 -0500, Pranith Kumar wrote: > On Mon, Dec 29, 2014 at 5:03 AM, Martin Schwidefsky > wrote: > > On Sat, 27 Dec 2014 12:17:43 -0500 > > Pranith Kumar wrote: > > > >> @@ -65,10 +65,13 @@ > >> #include > >> #include > >> #include > >> -#include > >> #include > >> #include > >> > >> +#if IS_ENABLED(CONFIG_KVM) > >> +#include > >> +#endif > >> + > >> #ifdef DEBUG > >> #define DBG(fmt...) udbg_printf(fmt) > >> #else > > > > I always cringe when I see an include protected by an #ifdef. > > Is this really necessary? All that is done in asm-offsets.c is > > to calculate offsets, the code where the two offsets in question > > are used (entry64.S) does have the #ifdef for CONFIG_KVM. > > I agree that this is not the ideal way to do this. But, it has been > the way things were already being done. If you see > arch/powerpc/kernel/asm-offsets.c, there are quite some includes which > are within ifdefs. asm-offsets.c is unusual in that respect, and I think most of those ifdefs could go away without breaking anything (head_booke.h is not a normal header file, and kvm_book3s.h should just be removed as it will be pulled in by kvm_ppc.h if applicable). > I've considered other alternatives (though not in-depth) and found > that they will require quite some refactoring. One simple idea is to > move this #ifdef to within kvm_ppc.h. That should make the inclusion > of this file a no-op in all the places where this is being included > without KVM being enabled. But I am not 100% sure of that approach. > > Any suggestions are welcome. As I suggested elsewhere in the thread, why not be more fine-grained in what you ifdef in the srcu header? How will that require excessive refactoring? Or, just stick with the linker error. I also wonder if this is worthwhile just to save around 2000 bytes. What other core synchronization mechanisms are optional? What real-world configs will actually have this disabled? -Scott -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, 2014-12-29 at 23:32 -0500, Pranith Kumar wrote: On Mon, Dec 29, 2014 at 5:03 AM, Martin Schwidefsky schwidef...@de.ibm.com wrote: On Sat, 27 Dec 2014 12:17:43 -0500 Pranith Kumar bobby.pr...@gmail.com wrote: @@ -65,10 +65,13 @@ #include asm/kexec.h #include asm/mmu_context.h #include asm/code-patching.h -#include asm/kvm_ppc.h #include asm/hugetlb.h #include asm/epapr_hcalls.h +#if IS_ENABLED(CONFIG_KVM) +#include asm/kvm_ppc.h +#endif + #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else I always cringe when I see an include protected by an #ifdef. Is this really necessary? All that is done in asm-offsets.c is to calculate offsets, the code where the two offsets in question are used (entry64.S) does have the #ifdef for CONFIG_KVM. I agree that this is not the ideal way to do this. But, it has been the way things were already being done. If you see arch/powerpc/kernel/asm-offsets.c, there are quite some includes which are within ifdefs. asm-offsets.c is unusual in that respect, and I think most of those ifdefs could go away without breaking anything (head_booke.h is not a normal header file, and kvm_book3s.h should just be removed as it will be pulled in by kvm_ppc.h if applicable). I've considered other alternatives (though not in-depth) and found that they will require quite some refactoring. One simple idea is to move this #ifdef to within kvm_ppc.h. That should make the inclusion of this file a no-op in all the places where this is being included without KVM being enabled. But I am not 100% sure of that approach. Any suggestions are welcome. As I suggested elsewhere in the thread, why not be more fine-grained in what you ifdef in the srcu header? How will that require excessive refactoring? Or, just stick with the linker error. I also wonder if this is worthwhile just to save around 2000 bytes. What other core synchronization mechanisms are optional? What real-world configs will actually have this disabled? -Scott -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, Dec 29, 2014 at 6:05 PM, Scott Wood wrote: > On Sat, 2014-12-27 at 12:17 -0500, Pranith Kumar wrote: >> Isolate the SRCU functions and data structures within CONFIG_SRCU so that >> there >> is a compile time failure if srcu is used when not enabled. This was decided >> to >> be better than waiting until link time for a failure to occur. > > Yes, false positives and extra ifdefs are so much better. :-P > > Why not just ifdef the functions/macros, and leave the types alone? If > you're worried about direct access to struct members, you could even > ifdef the members away while leaving the struct itself. It is not > normal practice in Linux to need ifdefs around #includes. Yup, totally agree that this is not ideal. The idea here is to not even compile the structure for tinification purposes. ifdefs for headers are ugly, but given the current code structure, I was not able to figure out any other way around it without major overhaul. > >> There are places which include kvm headers and utilize kvm data structures >> without checking if KVM is enabled. In two such archs(s390, ppc64), the >> current >> patch makes the uses of KVM conditional on KVM being enabled. The other >> option, >> which is to enable KVM unconditionally seemed a bit too much as we could >> easily >> figure out KVM only parts and enclose them in ifdefs. > > Maybe not so easy (mpc85xx_smp_defconfig with NOTIFY stuff turned off so > that SRCU gets deselected): > > In file included from > /home/scott/fsl/git/linux/upstream/arch/powerpc/include/asm/kvm_ppc.h:30:0, > from > /home/scott/fsl/git/linux/upstream/arch/powerpc/kernel/smp.c:39: > /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:366:21: error: > field 'srcu' has incomplete type > /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:367:21: error: > field 'irq_srcu' has incomplete type > /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for > target 'arch/powerpc/kernel/smp.o' failed > make[2]: *** [arch/powerpc/kernel/smp.o] Error 1 > /home/scott/fsl/git/linux/upstream/Makefile:955: recipe for target > 'arch/powerpc/kernel' failed > make[1]: *** [arch/powerpc/kernel] Error 2 > make[1]: *** Waiting for unfinished jobs > > Are you sure KVM is the only SRCU user so impacted? It's also likely > that new such problems get introduced, because most people are going to > have SRCU enabled and thus not notice the breakage they're adding. Well, it is the major one which I encountered until now. There might be other problems lurking which I will gladly try to fix if and when they are reported. > > There's also at least one place that needs to be fixed, that currently > expects to get other headers indirectly via srcu.h: > > /home/scott/fsl/git/linux/upstream/lib/assoc_array.c: In function > 'assoc_array_apply_edit': > /home/scott/fsl/git/linux/upstream/lib/assoc_array.c:1425:2: error: implicit > declaration of function 'call_rcu' [-Werror=implicit-function-declaration] > cc1: some warnings being treated as errors > /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for > target 'lib/assoc_array.o' failed I will send a patch fixing this(need to use rcupdate.h here explicitly). Thanks for reporting these! > > -Scott > > -- Pranith -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, Dec 29, 2014 at 5:03 AM, Martin Schwidefsky wrote: > On Sat, 27 Dec 2014 12:17:43 -0500 > Pranith Kumar wrote: > >> @@ -65,10 +65,13 @@ >> #include >> #include >> #include >> -#include >> #include >> #include >> >> +#if IS_ENABLED(CONFIG_KVM) >> +#include >> +#endif >> + >> #ifdef DEBUG >> #define DBG(fmt...) udbg_printf(fmt) >> #else > > I always cringe when I see an include protected by an #ifdef. > Is this really necessary? All that is done in asm-offsets.c is > to calculate offsets, the code where the two offsets in question > are used (entry64.S) does have the #ifdef for CONFIG_KVM. I agree that this is not the ideal way to do this. But, it has been the way things were already being done. If you see arch/powerpc/kernel/asm-offsets.c, there are quite some includes which are within ifdefs. I've considered other alternatives (though not in-depth) and found that they will require quite some refactoring. One simple idea is to move this #ifdef to within kvm_ppc.h. That should make the inclusion of this file a no-op in all the places where this is being included without KVM being enabled. But I am not 100% sure of that approach. Any suggestions are welcome. -- Pranith -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Sat, 2014-12-27 at 12:17 -0500, Pranith Kumar wrote: > Isolate the SRCU functions and data structures within CONFIG_SRCU so that > there > is a compile time failure if srcu is used when not enabled. This was decided > to > be better than waiting until link time for a failure to occur. Yes, false positives and extra ifdefs are so much better. :-P Why not just ifdef the functions/macros, and leave the types alone? If you're worried about direct access to struct members, you could even ifdef the members away while leaving the struct itself. It is not normal practice in Linux to need ifdefs around #includes. > There are places which include kvm headers and utilize kvm data structures > without checking if KVM is enabled. In two such archs(s390, ppc64), the > current > patch makes the uses of KVM conditional on KVM being enabled. The other > option, > which is to enable KVM unconditionally seemed a bit too much as we could > easily > figure out KVM only parts and enclose them in ifdefs. Maybe not so easy (mpc85xx_smp_defconfig with NOTIFY stuff turned off so that SRCU gets deselected): In file included from /home/scott/fsl/git/linux/upstream/arch/powerpc/include/asm/kvm_ppc.h:30:0, from /home/scott/fsl/git/linux/upstream/arch/powerpc/kernel/smp.c:39: /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:366:21: error: field 'srcu' has incomplete type /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:367:21: error: field 'irq_srcu' has incomplete type /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for target 'arch/powerpc/kernel/smp.o' failed make[2]: *** [arch/powerpc/kernel/smp.o] Error 1 /home/scott/fsl/git/linux/upstream/Makefile:955: recipe for target 'arch/powerpc/kernel' failed make[1]: *** [arch/powerpc/kernel] Error 2 make[1]: *** Waiting for unfinished jobs Are you sure KVM is the only SRCU user so impacted? It's also likely that new such problems get introduced, because most people are going to have SRCU enabled and thus not notice the breakage they're adding. There's also at least one place that needs to be fixed, that currently expects to get other headers indirectly via srcu.h: /home/scott/fsl/git/linux/upstream/lib/assoc_array.c: In function 'assoc_array_apply_edit': /home/scott/fsl/git/linux/upstream/lib/assoc_array.c:1425:2: error: implicit declaration of function 'call_rcu' [-Werror=implicit-function-declaration] cc1: some warnings being treated as errors /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for target 'lib/assoc_array.o' failed -Scott -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Sat, 27 Dec 2014 12:17:43 -0500 Pranith Kumar wrote: > @@ -65,10 +65,13 @@ > #include > #include > #include > -#include > #include > #include > > +#if IS_ENABLED(CONFIG_KVM) > +#include > +#endif > + > #ifdef DEBUG > #define DBG(fmt...) udbg_printf(fmt) > #else I always cringe when I see an include protected by an #ifdef. Is this really necessary? All that is done in asm-offsets.c is to calculate offsets, the code where the two offsets in question are used (entry64.S) does have the #ifdef for CONFIG_KVM. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Sat, 27 Dec 2014 12:17:43 -0500 Pranith Kumar bobby.pr...@gmail.com wrote: @@ -65,10 +65,13 @@ #include asm/kexec.h #include asm/mmu_context.h #include asm/code-patching.h -#include asm/kvm_ppc.h #include asm/hugetlb.h #include asm/epapr_hcalls.h +#if IS_ENABLED(CONFIG_KVM) +#include asm/kvm_ppc.h +#endif + #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else I always cringe when I see an include protected by an #ifdef. Is this really necessary? All that is done in asm-offsets.c is to calculate offsets, the code where the two offsets in question are used (entry64.S) does have the #ifdef for CONFIG_KVM. -- blue skies, Martin. Reality continues to ruin my life. - Calvin. -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Sat, 2014-12-27 at 12:17 -0500, Pranith Kumar wrote: Isolate the SRCU functions and data structures within CONFIG_SRCU so that there is a compile time failure if srcu is used when not enabled. This was decided to be better than waiting until link time for a failure to occur. Yes, false positives and extra ifdefs are so much better. :-P Why not just ifdef the functions/macros, and leave the types alone? If you're worried about direct access to struct members, you could even ifdef the members away while leaving the struct itself. It is not normal practice in Linux to need ifdefs around #includes. There are places which include kvm headers and utilize kvm data structures without checking if KVM is enabled. In two such archs(s390, ppc64), the current patch makes the uses of KVM conditional on KVM being enabled. The other option, which is to enable KVM unconditionally seemed a bit too much as we could easily figure out KVM only parts and enclose them in ifdefs. Maybe not so easy (mpc85xx_smp_defconfig with NOTIFY stuff turned off so that SRCU gets deselected): In file included from /home/scott/fsl/git/linux/upstream/arch/powerpc/include/asm/kvm_ppc.h:30:0, from /home/scott/fsl/git/linux/upstream/arch/powerpc/kernel/smp.c:39: /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:366:21: error: field 'srcu' has incomplete type /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:367:21: error: field 'irq_srcu' has incomplete type /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for target 'arch/powerpc/kernel/smp.o' failed make[2]: *** [arch/powerpc/kernel/smp.o] Error 1 /home/scott/fsl/git/linux/upstream/Makefile:955: recipe for target 'arch/powerpc/kernel' failed make[1]: *** [arch/powerpc/kernel] Error 2 make[1]: *** Waiting for unfinished jobs Are you sure KVM is the only SRCU user so impacted? It's also likely that new such problems get introduced, because most people are going to have SRCU enabled and thus not notice the breakage they're adding. There's also at least one place that needs to be fixed, that currently expects to get other headers indirectly via srcu.h: /home/scott/fsl/git/linux/upstream/lib/assoc_array.c: In function 'assoc_array_apply_edit': /home/scott/fsl/git/linux/upstream/lib/assoc_array.c:1425:2: error: implicit declaration of function 'call_rcu' [-Werror=implicit-function-declaration] cc1: some warnings being treated as errors /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for target 'lib/assoc_array.o' failed -Scott -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, Dec 29, 2014 at 5:03 AM, Martin Schwidefsky schwidef...@de.ibm.com wrote: On Sat, 27 Dec 2014 12:17:43 -0500 Pranith Kumar bobby.pr...@gmail.com wrote: @@ -65,10 +65,13 @@ #include asm/kexec.h #include asm/mmu_context.h #include asm/code-patching.h -#include asm/kvm_ppc.h #include asm/hugetlb.h #include asm/epapr_hcalls.h +#if IS_ENABLED(CONFIG_KVM) +#include asm/kvm_ppc.h +#endif + #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else I always cringe when I see an include protected by an #ifdef. Is this really necessary? All that is done in asm-offsets.c is to calculate offsets, the code where the two offsets in question are used (entry64.S) does have the #ifdef for CONFIG_KVM. I agree that this is not the ideal way to do this. But, it has been the way things were already being done. If you see arch/powerpc/kernel/asm-offsets.c, there are quite some includes which are within ifdefs. I've considered other alternatives (though not in-depth) and found that they will require quite some refactoring. One simple idea is to move this #ifdef to within kvm_ppc.h. That should make the inclusion of this file a no-op in all the places where this is being included without KVM being enabled. But I am not 100% sure of that approach. Any suggestions are welcome. -- Pranith -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, Dec 29, 2014 at 6:05 PM, Scott Wood scottw...@freescale.com wrote: On Sat, 2014-12-27 at 12:17 -0500, Pranith Kumar wrote: Isolate the SRCU functions and data structures within CONFIG_SRCU so that there is a compile time failure if srcu is used when not enabled. This was decided to be better than waiting until link time for a failure to occur. Yes, false positives and extra ifdefs are so much better. :-P Why not just ifdef the functions/macros, and leave the types alone? If you're worried about direct access to struct members, you could even ifdef the members away while leaving the struct itself. It is not normal practice in Linux to need ifdefs around #includes. Yup, totally agree that this is not ideal. The idea here is to not even compile the structure for tinification purposes. ifdefs for headers are ugly, but given the current code structure, I was not able to figure out any other way around it without major overhaul. There are places which include kvm headers and utilize kvm data structures without checking if KVM is enabled. In two such archs(s390, ppc64), the current patch makes the uses of KVM conditional on KVM being enabled. The other option, which is to enable KVM unconditionally seemed a bit too much as we could easily figure out KVM only parts and enclose them in ifdefs. Maybe not so easy (mpc85xx_smp_defconfig with NOTIFY stuff turned off so that SRCU gets deselected): In file included from /home/scott/fsl/git/linux/upstream/arch/powerpc/include/asm/kvm_ppc.h:30:0, from /home/scott/fsl/git/linux/upstream/arch/powerpc/kernel/smp.c:39: /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:366:21: error: field 'srcu' has incomplete type /home/scott/fsl/git/linux/upstream/include/linux/kvm_host.h:367:21: error: field 'irq_srcu' has incomplete type /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for target 'arch/powerpc/kernel/smp.o' failed make[2]: *** [arch/powerpc/kernel/smp.o] Error 1 /home/scott/fsl/git/linux/upstream/Makefile:955: recipe for target 'arch/powerpc/kernel' failed make[1]: *** [arch/powerpc/kernel] Error 2 make[1]: *** Waiting for unfinished jobs Are you sure KVM is the only SRCU user so impacted? It's also likely that new such problems get introduced, because most people are going to have SRCU enabled and thus not notice the breakage they're adding. Well, it is the major one which I encountered until now. There might be other problems lurking which I will gladly try to fix if and when they are reported. There's also at least one place that needs to be fixed, that currently expects to get other headers indirectly via srcu.h: /home/scott/fsl/git/linux/upstream/lib/assoc_array.c: In function 'assoc_array_apply_edit': /home/scott/fsl/git/linux/upstream/lib/assoc_array.c:1425:2: error: implicit declaration of function 'call_rcu' [-Werror=implicit-function-declaration] cc1: some warnings being treated as errors /home/scott/fsl/git/linux/upstream/scripts/Makefile.build:257: recipe for target 'lib/assoc_array.o' failed I will send a patch fixing this(need to use rcupdate.h here explicitly). Thanks for reporting these! -Scott -- Pranith -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
There are places which include kvm headers and utilize kvm data structures
without checking if KVM is enabled. In two such archs(s390, ppc64), the current
patch makes the uses of KVM conditional on KVM being enabled. The other option,
which is to enable KVM unconditionally seemed a bit too much as we could easily
figure out KVM only parts and enclose them in ifdefs.
Signed-off-by: Pranith Kumar
---
arch/powerpc/kernel/setup_64.c | 7 ++-
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47 --
include/linux/srcu.h | 6 +-
4 files changed, 44 insertions(+), 23 deletions(-)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 4f3cfe1..f55302f 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -65,10 +65,13 @@
#include
#include
#include
-#include
#include
#include
+#if IS_ENABLED(CONFIG_KVM)
+#include
+#endif
+
#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
@@ -286,8 +289,10 @@ void __init early_setup(unsigned long dt_ptr)
*/
cpu_ready_for_interrupts();
+#if IS_ENABLED(CONFIG_KVM)
/* Reserve large chunks of memory for use by CMA for KVM */
kvm_cma_reserve();
+#endif
/*
* Reserve any gigantic pages requested on the command line.
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..2813a3c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include
-#include
#include
#include
#include
#include
+#if IS_ENABLED(CONFIG_KVM)
+#include
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the "Q" assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#if IS_ENABLED(CONFIG_KVM)
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init(&(name)->lock); \
(name)->head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)->head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
There are places which include kvm headers and utilize kvm data structures
without checking if KVM is enabled. In two such archs(s390, ppc64), the current
patch makes the uses of KVM conditional on KVM being enabled. The other option,
which is to enable KVM unconditionally seemed a bit too much as we could easily
figure out KVM only parts and enclose them in ifdefs.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
---
arch/powerpc/kernel/setup_64.c | 7 ++-
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47 --
include/linux/srcu.h | 6 +-
4 files changed, 44 insertions(+), 23 deletions(-)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 4f3cfe1..f55302f 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -65,10 +65,13 @@
#include asm/kexec.h
#include asm/mmu_context.h
#include asm/code-patching.h
-#include asm/kvm_ppc.h
#include asm/hugetlb.h
#include asm/epapr_hcalls.h
+#if IS_ENABLED(CONFIG_KVM)
+#include asm/kvm_ppc.h
+#endif
+
#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
@@ -286,8 +289,10 @@ void __init early_setup(unsigned long dt_ptr)
*/
cpu_ready_for_interrupts();
+#if IS_ENABLED(CONFIG_KVM)
/* Reserve large chunks of memory for use by CMA for KVM */
kvm_cma_reserve();
+#endif
/*
* Reserve any gigantic pages requested on the command line.
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..2813a3c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include linux/kbuild.h
-#include linux/kvm_host.h
#include linux/sched.h
#include asm/idle.h
#include asm/vdso.h
#include asm/pgtable.h
+#if IS_ENABLED(CONFIG_KVM)
+#include linux/kvm_host.h
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the Q assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#if IS_ENABLED(CONFIG_KVM)
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Tue, Dec 09, 2014 at 01:48:21PM -0500, Pranith Kumar wrote:
> Isolate the SRCU functions and data structures within CONFIG_SRCU so that
> there
> is a compile time failure if srcu is used when not enabled. This was decided
> to
> be better than waiting until link time for a failure to occur.
>
> Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
> prevents build failures as KVM is dependent on SRCU.
>
> Signed-off-by: Pranith Kumar
> CC: Paul E. McKenney
> CC: Josh Triplett
> CC: Lai Jiangshan
> Signed-off-by: Paul E. McKenney
Queued for testing (finally), replacing the earlier patch. ;-)
Thanx, Paul
> ---
> arch/s390/kernel/asm-offsets.c | 7 ++-
> include/linux/notifier.h | 47
> --
> include/linux/srcu.h | 6 +-
> 3 files changed, 38 insertions(+), 22 deletions(-)
>
> diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
> index ef279a1..2813a3c 100644
> --- a/arch/s390/kernel/asm-offsets.c
> +++ b/arch/s390/kernel/asm-offsets.c
> @@ -7,12 +7,15 @@
> #define ASM_OFFSETS_C
>
> #include
> -#include
> #include
> #include
> #include
> #include
>
> +#if IS_ENABLED(CONFIG_KVM)
> +#include
> +#endif
> +
> /*
> * Make sure that the compiler is new enough. We want a compiler that
> * is known to work with the "Q" assembler constraint.
> @@ -182,8 +185,10 @@ int main(void)
> DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
> DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
> thread.trap_tdb));
> DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
> +#if IS_ENABLED(CONFIG_KVM)
> DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
> DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
> +#endif /* CONFIG_KVM */
> #endif /* CONFIG_32BIT */
> return 0;
> }
> diff --git a/include/linux/notifier.h b/include/linux/notifier.h
> index d14a4c3..fe4f02a 100644
> --- a/include/linux/notifier.h
> +++ b/include/linux/notifier.h
> @@ -47,6 +47,8 @@
> * runtime initialization.
> */
>
> +struct notifier_block;
> +
> typedef int (*notifier_fn_t)(struct notifier_block *nb,
> unsigned long action, void *data);
>
> @@ -70,12 +72,6 @@ struct raw_notifier_head {
> struct notifier_block __rcu *head;
> };
>
> -struct srcu_notifier_head {
> - struct mutex mutex;
> - struct srcu_struct srcu;
> - struct notifier_block __rcu *head;
> -};
> -
> #define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
> spin_lock_init(&(name)->lock); \
> (name)->head = NULL;\
> @@ -88,11 +84,6 @@ struct srcu_notifier_head {
> (name)->head = NULL;\
> } while (0)
>
> -/* srcu_notifier_heads must be initialized and cleaned up dynamically */
> -extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
> -#define srcu_cleanup_notifier_head(name) \
> - cleanup_srcu_struct(&(name)->srcu);
> -
> #define ATOMIC_NOTIFIER_INIT(name) { \
> .lock = __SPIN_LOCK_UNLOCKED(name.lock),\
> .head = NULL }
> @@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
> srcu_notifier_head *nh);
> .head = NULL }
> #define RAW_NOTIFIER_INIT(name) { \
> .head = NULL }
> -/* srcu_notifier_heads cannot be initialized statically */
>
> #define ATOMIC_NOTIFIER_HEAD(name) \
> struct atomic_notifier_head name = \
> @@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
> - struct notifier_block *nb);
>
> extern int blocking_notifier_chain_cond_register(
> struct blocking_notifier_head *nh,
> @@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
> - struct notifier_block *nb);
>
> extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
> unsigned long val, void *v);
> @@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
> raw_notifier_head *nh,
> unsigned long val, void *v);
> extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
> unsigned long val, void *v, int nr_to_call, int *nr_calls);
> -extern int
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
- Original Message -
> From: "Pranith Kumar"
> To: "Martin Schwidefsky" , "Heiko Carstens"
> , "supporter:S390"
> , "Lai Jiangshan" , "Paul E.
> McKenney" ,
> "Josh Triplett" , "Steven Rostedt"
> , "Mathieu Desnoyers"
> , "Christian Borntraeger"
> , "Jens Freimann"
> , "open list:S390" ,
> "open list"
>
> Sent: Tuesday, December 9, 2014 1:48:21 PM
> Subject: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
>
> Isolate the SRCU functions and data structures within CONFIG_SRCU so that
> there
> is a compile time failure if srcu is used when not enabled. This was decided
> to
> be better than waiting until link time for a failure to occur.
>
> Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
> prevents build failures as KVM is dependent on SRCU.
>
> Signed-off-by: Pranith Kumar
> CC: Paul E. McKenney
> CC: Josh Triplett
> CC: Lai Jiangshan
> Signed-off-by: Paul E. McKenney
> ---
> arch/s390/kernel/asm-offsets.c | 7 ++-
> include/linux/notifier.h | 47
> --
> include/linux/srcu.h | 6 +-
> 3 files changed, 38 insertions(+), 22 deletions(-)
>
> diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
> index ef279a1..2813a3c 100644
> --- a/arch/s390/kernel/asm-offsets.c
> +++ b/arch/s390/kernel/asm-offsets.c
> @@ -7,12 +7,15 @@
> #define ASM_OFFSETS_C
>
> #include
> -#include
> #include
> #include
> #include
> #include
>
> +#if IS_ENABLED(CONFIG_KVM)
> +#include
> +#endif
> +
Seeing this kind of conditional include makes me cringe. Is there some
way to hide this within linux/kvm_host.h instead ?
Thanks,
Mathieu
> /*
> * Make sure that the compiler is new enough. We want a compiler that
> * is known to work with the "Q" assembler constraint.
> @@ -182,8 +185,10 @@ int main(void)
> DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
> DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
> thread.trap_tdb));
> DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
> +#if IS_ENABLED(CONFIG_KVM)
> DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
> DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
> +#endif /* CONFIG_KVM */
> #endif /* CONFIG_32BIT */
> return 0;
> }
> diff --git a/include/linux/notifier.h b/include/linux/notifier.h
> index d14a4c3..fe4f02a 100644
> --- a/include/linux/notifier.h
> +++ b/include/linux/notifier.h
> @@ -47,6 +47,8 @@
> * runtime initialization.
> */
>
> +struct notifier_block;
> +
> typedef int (*notifier_fn_t)(struct notifier_block *nb,
> unsigned long action, void *data);
>
> @@ -70,12 +72,6 @@ struct raw_notifier_head {
> struct notifier_block __rcu *head;
> };
>
> -struct srcu_notifier_head {
> - struct mutex mutex;
> - struct srcu_struct srcu;
> - struct notifier_block __rcu *head;
> -};
> -
> #define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
> spin_lock_init(&(name)->lock); \
> (name)->head = NULL;\
> @@ -88,11 +84,6 @@ struct srcu_notifier_head {
> (name)->head = NULL;\
> } while (0)
>
> -/* srcu_notifier_heads must be initialized and cleaned up dynamically */
> -extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
> -#define srcu_cleanup_notifier_head(name) \
> - cleanup_srcu_struct(&(name)->srcu);
> -
> #define ATOMIC_NOTIFIER_INIT(name) { \
> .lock = __SPIN_LOCK_UNLOCKED(name.lock),\
> .head = NULL }
> @@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
> srcu_notifier_head *nh);
> .head = NULL }
> #define RAW_NOTIFIER_INIT(name) { \
> .head = NULL }
> -/* srcu_notifier_heads cannot be initialized statically */
>
> #define ATOMIC_NOTIFIER_HEAD(name) \
> struct atomic_notifier_head name = \
> @@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
> - struct noti
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Signed-off-by: Pranith Kumar
CC: Paul E. McKenney
CC: Josh Triplett
CC: Lai Jiangshan
Signed-off-by: Paul E. McKenney
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47 --
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..2813a3c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include
-#include
#include
#include
#include
#include
+#if IS_ENABLED(CONFIG_KVM)
+#include
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the "Q" assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#if IS_ENABLED(CONFIG_KVM)
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init(&(name)->lock); \
(name)->head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)->head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE0x /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
@@ -211,5
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Tue, Dec 09, 2014 at 09:16:46AM -0500, Pranith Kumar wrote:
> Isolate the SRCU functions and data structures within CONFIG_SRCU so that
> there
> is a compile time failure if srcu is used when not enabled. This was decided
> to
> be better than waiting until link time for a failure to occur.
>
> Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
> prevents build failures as KVM is dependent on SRCU.
Queued for testing, thank you!
Thanx, Paul
> Signed-off-by: Pranith Kumar
> Acked-by: Christian Borntraeger [for s390 parts]
> CC: Josh Triplett
> CC: Lai Jiangshan
> CC: Paul E. McKenney
> ---
> arch/s390/kernel/asm-offsets.c | 7 ++-
> include/linux/notifier.h | 47
> --
> include/linux/srcu.h | 6 +-
> 3 files changed, 38 insertions(+), 22 deletions(-)
>
> diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
> index ef279a1..055334d 100644
> --- a/arch/s390/kernel/asm-offsets.c
> +++ b/arch/s390/kernel/asm-offsets.c
> @@ -7,12 +7,15 @@
> #define ASM_OFFSETS_C
>
> #include
> -#include
> #include
> #include
> #include
> #include
>
> +#ifdef CONFIG_KVM
> +#include
> +#endif
> +
> /*
> * Make sure that the compiler is new enough. We want a compiler that
> * is known to work with the "Q" assembler constraint.
> @@ -182,8 +185,10 @@ int main(void)
> DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
> DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
> thread.trap_tdb));
> DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
> +#ifdef CONFIG_KVM
> DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
> DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
> +#endif /* CONFIG_KVM */
> #endif /* CONFIG_32BIT */
> return 0;
> }
> diff --git a/include/linux/notifier.h b/include/linux/notifier.h
> index d14a4c3..fe4f02a 100644
> --- a/include/linux/notifier.h
> +++ b/include/linux/notifier.h
> @@ -47,6 +47,8 @@
> * runtime initialization.
> */
>
> +struct notifier_block;
> +
> typedef int (*notifier_fn_t)(struct notifier_block *nb,
> unsigned long action, void *data);
>
> @@ -70,12 +72,6 @@ struct raw_notifier_head {
> struct notifier_block __rcu *head;
> };
>
> -struct srcu_notifier_head {
> - struct mutex mutex;
> - struct srcu_struct srcu;
> - struct notifier_block __rcu *head;
> -};
> -
> #define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
> spin_lock_init(&(name)->lock); \
> (name)->head = NULL;\
> @@ -88,11 +84,6 @@ struct srcu_notifier_head {
> (name)->head = NULL;\
> } while (0)
>
> -/* srcu_notifier_heads must be initialized and cleaned up dynamically */
> -extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
> -#define srcu_cleanup_notifier_head(name) \
> - cleanup_srcu_struct(&(name)->srcu);
> -
> #define ATOMIC_NOTIFIER_INIT(name) { \
> .lock = __SPIN_LOCK_UNLOCKED(name.lock),\
> .head = NULL }
> @@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
> srcu_notifier_head *nh);
> .head = NULL }
> #define RAW_NOTIFIER_INIT(name) { \
> .head = NULL }
> -/* srcu_notifier_heads cannot be initialized statically */
>
> #define ATOMIC_NOTIFIER_HEAD(name) \
> struct atomic_notifier_head name = \
> @@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
> - struct notifier_block *nb);
>
> extern int blocking_notifier_chain_cond_register(
> struct blocking_notifier_head *nh,
> @@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
> - struct notifier_block *nb);
>
> extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
> unsigned long val, void *v);
> @@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
> raw_notifier_head *nh,
> unsigned long val, void *v);
> extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
> unsigned long val, void *v, int nr_to_call, int *nr_calls);
> -extern int srcu_notifier_call_chain(struct
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Signed-off-by: Pranith Kumar
Acked-by: Christian Borntraeger [for s390 parts]
CC: Josh Triplett
CC: Lai Jiangshan
CC: Paul E. McKenney
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47 --
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..055334d 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include
-#include
#include
#include
#include
#include
+#ifdef CONFIG_KVM
+#include
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the "Q" assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#ifdef CONFIG_KVM
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init(&(name)->lock); \
(name)->head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)->head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE0x /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
@@ -211,5
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
Acked-by: Christian Borntraeger borntrae...@de.ibm.com [for s390 parts]
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47 --
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..055334d 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include linux/kbuild.h
-#include linux/kvm_host.h
#include linux/sched.h
#include asm/idle.h
#include asm/vdso.h
#include asm/pgtable.h
+#ifdef CONFIG_KVM
+#include linux/kvm_host.h
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the Q assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#ifdef CONFIG_KVM
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
-
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Tue, Dec 09, 2014 at 09:16:46AM -0500, Pranith Kumar wrote:
Isolate the SRCU functions and data structures within CONFIG_SRCU so that
there
is a compile time failure if srcu is used when not enabled. This was decided
to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Queued for testing, thank you!
Thanx, Paul
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
Acked-by: Christian Borntraeger borntrae...@de.ibm.com [for s390 parts]
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47
--
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..055334d 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include linux/kbuild.h
-#include linux/kvm_host.h
#include linux/sched.h
#include asm/idle.h
#include asm/vdso.h
#include asm/pgtable.h
+#ifdef CONFIG_KVM
+#include linux/kvm_host.h
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the Q assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#ifdef CONFIG_KVM
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedef int (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name) { \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
Signed-off-by: Paul E. McKenney paul...@linux.vnet.ibm.com
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47 --
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..2813a3c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include linux/kbuild.h
-#include linux/kvm_host.h
#include linux/sched.h
#include asm/idle.h
#include asm/vdso.h
#include asm/pgtable.h
+#if IS_ENABLED(CONFIG_KVM)
+#include linux/kvm_host.h
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the Q assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#if IS_ENABLED(CONFIG_KVM)
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
-
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
- Original Message -
From: Pranith Kumar bobby.pr...@gmail.com
To: Martin Schwidefsky schwidef...@de.ibm.com, Heiko Carstens
heiko.carst...@de.ibm.com, supporter:S390
linux...@de.ibm.com, Lai Jiangshan la...@cn.fujitsu.com, Paul E.
McKenney paul...@linux.vnet.ibm.com,
Josh Triplett j...@joshtriplett.org, Steven Rostedt
rost...@goodmis.org, Mathieu Desnoyers
mathieu.desnoy...@efficios.com, Christian Borntraeger
borntrae...@de.ibm.com, Jens Freimann
jf...@linux.vnet.ibm.com, open list:S390 linux-s...@vger.kernel.org,
open list
linux-kernel@vger.kernel.org
Sent: Tuesday, December 9, 2014 1:48:21 PM
Subject: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that
there
is a compile time failure if srcu is used when not enabled. This was decided
to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
Signed-off-by: Paul E. McKenney paul...@linux.vnet.ibm.com
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47
--
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..2813a3c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include linux/kbuild.h
-#include linux/kvm_host.h
#include linux/sched.h
#include asm/idle.h
#include asm/vdso.h
#include asm/pgtable.h
+#if IS_ENABLED(CONFIG_KVM)
+#include linux/kvm_host.h
+#endif
+
Seeing this kind of conditional include makes me cringe. Is there some
way to hide this within linux/kvm_host.h instead ?
Thanks,
Mathieu
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the Q assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#if IS_ENABLED(CONFIG_KVM)
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedef int (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name) { \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Tue, Dec 09, 2014 at 01:48:21PM -0500, Pranith Kumar wrote:
Isolate the SRCU functions and data structures within CONFIG_SRCU so that
there
is a compile time failure if srcu is used when not enabled. This was decided
to
be better than waiting until link time for a failure to occur.
Also make including kvm_host.h conditional on CONFIG_KVM being enabled. This
prevents build failures as KVM is dependent on SRCU.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
Signed-off-by: Paul E. McKenney paul...@linux.vnet.ibm.com
Queued for testing (finally), replacing the earlier patch. ;-)
Thanx, Paul
---
arch/s390/kernel/asm-offsets.c | 7 ++-
include/linux/notifier.h | 47
--
include/linux/srcu.h | 6 +-
3 files changed, 38 insertions(+), 22 deletions(-)
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index ef279a1..2813a3c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,12 +7,15 @@
#define ASM_OFFSETS_C
#include linux/kbuild.h
-#include linux/kvm_host.h
#include linux/sched.h
#include asm/idle.h
#include asm/vdso.h
#include asm/pgtable.h
+#if IS_ENABLED(CONFIG_KVM)
+#include linux/kvm_host.h
+#endif
+
/*
* Make sure that the compiler is new enough. We want a compiler that
* is known to work with the Q assembler constraint.
@@ -182,8 +185,10 @@ int main(void)
DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb));
DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct,
thread.trap_tdb));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
+#if IS_ENABLED(CONFIG_KVM)
DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c));
DEFINE(__SIE_PROG20, offsetof(struct kvm_s390_sie_block, prog20));
+#endif /* CONFIG_KVM */
#endif /* CONFIG_32BIT */
return 0;
}
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedef int (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name) { \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Signed-off-by: Pranith Kumar
CC: Paul E. McKenney
CC: Josh Triplett
CC: Lai Jiangshan
---
include/linux/notifier.h | 47 +++
include/linux/srcu.h | 6 +-
2 files changed, 32 insertions(+), 21 deletions(-)
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init(&(name)->lock); \
(name)->head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)->head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE0x /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
@@ -211,5 +193,30 @@ static inline int notifier_to_errno(int ret)
extern struct blocking_notifier_head reboot_notifier_list;
+#ifdef CONFIG_SRCU
+
+struct srcu_notifier_head {
+ struct mutex mutex;
+ struct srcu_struct srcu;
+ struct notifier_block __rcu *head;
+};
+
+/* srcu_notifier_heads must be initialized and cleaned up dynamically
+ * srcu_notifier_heads cannot be initialized statically
+ */
+extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
+#define srcu_cleanup_notifier_head(name) cleanup_srcu_struct(&(name)->srcu)
+
+extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v);
+extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v, int nr_to_call, int *nr_calls);
+
+#endif /* CONFIG_SRCU */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */
diff --git a/include/linux/srcu.h
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, Dec 08, 2014 at 10:55:34AM -0500, Pranith Kumar wrote:
> Isolate the SRCU functions and data structures within CONFIG_SRCU so that
> there
> is a compile time failure if srcu is used when not enabled. This was decided
> to
> be better than waiting until link time for a failure to occur.
Queued, but the 0day test robot complained, so I dropped it. Looking
forward to an updated version. ;-)
Thanx, Paul
> Signed-off-by: Pranith Kumar
> CC: Paul E. McKenney
> CC: Josh Triplett
> CC: Lai Jiangshan
> ---
> include/linux/notifier.h | 45 +
> include/linux/srcu.h | 6 +-
> 2 files changed, 30 insertions(+), 21 deletions(-)
>
> diff --git a/include/linux/notifier.h b/include/linux/notifier.h
> index d14a4c3..291ecb1 100644
> --- a/include/linux/notifier.h
> +++ b/include/linux/notifier.h
> @@ -70,12 +70,6 @@ struct raw_notifier_head {
> struct notifier_block __rcu *head;
> };
>
> -struct srcu_notifier_head {
> - struct mutex mutex;
> - struct srcu_struct srcu;
> - struct notifier_block __rcu *head;
> -};
> -
> #define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
> spin_lock_init(&(name)->lock); \
> (name)->head = NULL;\
> @@ -88,11 +82,6 @@ struct srcu_notifier_head {
> (name)->head = NULL;\
> } while (0)
>
> -/* srcu_notifier_heads must be initialized and cleaned up dynamically */
> -extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
> -#define srcu_cleanup_notifier_head(name) \
> - cleanup_srcu_struct(&(name)->srcu);
> -
> #define ATOMIC_NOTIFIER_INIT(name) { \
> .lock = __SPIN_LOCK_UNLOCKED(name.lock),\
> .head = NULL }
> @@ -101,7 +90,6 @@ extern void srcu_init_notifier_head(struct
> srcu_notifier_head *nh);
> .head = NULL }
> #define RAW_NOTIFIER_INIT(name) { \
> .head = NULL }
> -/* srcu_notifier_heads cannot be initialized statically */
>
> #define ATOMIC_NOTIFIER_HEAD(name) \
> struct atomic_notifier_head name = \
> @@ -121,8 +109,6 @@ extern int blocking_notifier_chain_register(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
> - struct notifier_block *nb);
>
> extern int blocking_notifier_chain_cond_register(
> struct blocking_notifier_head *nh,
> @@ -134,8 +120,6 @@ extern int blocking_notifier_chain_unregister(struct
> blocking_notifier_head *nh,
> struct notifier_block *nb);
> extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
> struct notifier_block *nb);
> -extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
> - struct notifier_block *nb);
>
> extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
> unsigned long val, void *v);
> @@ -149,10 +133,6 @@ extern int raw_notifier_call_chain(struct
> raw_notifier_head *nh,
> unsigned long val, void *v);
> extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
> unsigned long val, void *v, int nr_to_call, int *nr_calls);
> -extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
> - unsigned long val, void *v);
> -extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
> - unsigned long val, void *v, int nr_to_call, int *nr_calls);
>
> #define NOTIFY_DONE 0x /* Don't care */
> #define NOTIFY_OK0x0001 /* Suits me */
> @@ -211,5 +191,30 @@ static inline int notifier_to_errno(int ret)
>
> extern struct blocking_notifier_head reboot_notifier_list;
>
> +#ifdef CONFIG_SRCU
> +
> +struct srcu_notifier_head {
> + struct mutex mutex;
> + struct srcu_struct srcu;
> + struct notifier_block __rcu *head;
> +};
> +
> +/* srcu_notifier_heads must be initialized and cleaned up dynamically
> + * srcu_notifier_heads cannot be initialized statically
> + */
> +extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
> +#define srcu_cleanup_notifier_head(name) cleanup_srcu_struct(&(name)->srcu)
> +
> +extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
> + struct notifier_block *nb);
> +extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
> + struct notifier_block *nb);
> +extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
> + unsigned long val, void *v);
> +extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
> + unsigned long val, void *v,
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Signed-off-by: Pranith Kumar
CC: Paul E. McKenney
CC: Josh Triplett
CC: Lai Jiangshan
---
include/linux/notifier.h | 45 +
include/linux/srcu.h | 6 +-
2 files changed, 30 insertions(+), 21 deletions(-)
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..291ecb1 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -70,12 +70,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init(&(name)->lock); \
(name)->head = NULL;\
@@ -88,11 +82,6 @@ struct srcu_notifier_head {
(name)->head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct(&(name)->srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +90,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +109,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +120,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +133,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE0x /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
@@ -211,5 +191,30 @@ static inline int notifier_to_errno(int ret)
extern struct blocking_notifier_head reboot_notifier_list;
+#ifdef CONFIG_SRCU
+
+struct srcu_notifier_head {
+ struct mutex mutex;
+ struct srcu_struct srcu;
+ struct notifier_block __rcu *head;
+};
+
+/* srcu_notifier_heads must be initialized and cleaned up dynamically
+ * srcu_notifier_heads cannot be initialized statically
+ */
+extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
+#define srcu_cleanup_notifier_head(name) cleanup_srcu_struct(&(name)->srcu)
+
+extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v);
+extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v, int nr_to_call, int *nr_calls);
+
+#endif /* CONFIG_SRCU */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 9cfd962..ed9c389 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -26,6 +26,8 @@
*
*/
+#ifdef CONFIG_SRCU
+
#ifndef _LINUX_SRCU_H
#define _LINUX_SRCU_H
@@ -249,4
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
---
include/linux/notifier.h | 45 +
include/linux/srcu.h | 6 +-
2 files changed, 30 insertions(+), 21 deletions(-)
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..291ecb1 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -70,12 +70,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +82,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +90,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +109,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +120,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +133,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE0x /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
@@ -211,5 +191,30 @@ static inline int notifier_to_errno(int ret)
extern struct blocking_notifier_head reboot_notifier_list;
+#ifdef CONFIG_SRCU
+
+struct srcu_notifier_head {
+ struct mutex mutex;
+ struct srcu_struct srcu;
+ struct notifier_block __rcu *head;
+};
+
+/* srcu_notifier_heads must be initialized and cleaned up dynamically
+ * srcu_notifier_heads cannot be initialized statically
+ */
+extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
+#define srcu_cleanup_notifier_head(name) cleanup_srcu_struct((name)-srcu)
+
+extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v);
+extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v, int nr_to_call, int *nr_calls);
+
+#endif /* CONFIG_SRCU */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 9cfd962..ed9c389 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -26,6 +26,8 @@
*
*/
Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
On Mon, Dec 08, 2014 at 10:55:34AM -0500, Pranith Kumar wrote:
Isolate the SRCU functions and data structures within CONFIG_SRCU so that
there
is a compile time failure if srcu is used when not enabled. This was decided
to
be better than waiting until link time for a failure to occur.
Queued, but the 0day test robot complained, so I dropped it. Looking
forward to an updated version. ;-)
Thanx, Paul
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
---
include/linux/notifier.h | 45 +
include/linux/srcu.h | 6 +-
2 files changed, 30 insertions(+), 21 deletions(-)
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..291ecb1 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -70,12 +70,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +82,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +90,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name) { \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +109,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +120,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +133,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE 0x /* Don't care */
#define NOTIFY_OK0x0001 /* Suits me */
@@ -211,5 +191,30 @@ static inline int notifier_to_errno(int ret)
extern struct blocking_notifier_head reboot_notifier_list;
+#ifdef CONFIG_SRCU
+
+struct srcu_notifier_head {
+ struct mutex mutex;
+ struct srcu_struct srcu;
+ struct notifier_block __rcu *head;
+};
+
+/* srcu_notifier_heads must be initialized and cleaned up dynamically
+ * srcu_notifier_heads cannot be initialized statically
+ */
+extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
+#define srcu_cleanup_notifier_head(name) cleanup_srcu_struct((name)-srcu)
+
+extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v);
+extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v, int nr_to_call, int
[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU
Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.
Signed-off-by: Pranith Kumar bobby.pr...@gmail.com
CC: Paul E. McKenney paul...@linux.vnet.ibm.com
CC: Josh Triplett j...@joshtriplett.org
CC: Lai Jiangshan la...@cn.fujitsu.com
---
include/linux/notifier.h | 47 +++
include/linux/srcu.h | 6 +-
2 files changed, 32 insertions(+), 21 deletions(-)
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c3..fe4f02a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -47,6 +47,8 @@
* runtime initialization.
*/
+struct notifier_block;
+
typedefint (*notifier_fn_t)(struct notifier_block *nb,
unsigned long action, void *data);
@@ -70,12 +72,6 @@ struct raw_notifier_head {
struct notifier_block __rcu *head;
};
-struct srcu_notifier_head {
- struct mutex mutex;
- struct srcu_struct srcu;
- struct notifier_block __rcu *head;
-};
-
#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
spin_lock_init((name)-lock); \
(name)-head = NULL;\
@@ -88,11 +84,6 @@ struct srcu_notifier_head {
(name)-head = NULL;\
} while (0)
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
-extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
-#define srcu_cleanup_notifier_head(name) \
- cleanup_srcu_struct((name)-srcu);
-
#define ATOMIC_NOTIFIER_INIT(name) { \
.lock = __SPIN_LOCK_UNLOCKED(name.lock),\
.head = NULL }
@@ -101,7 +92,6 @@ extern void srcu_init_notifier_head(struct
srcu_notifier_head *nh);
.head = NULL }
#define RAW_NOTIFIER_INIT(name){ \
.head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \
@@ -121,8 +111,6 @@ extern int blocking_notifier_chain_register(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int blocking_notifier_chain_cond_register(
struct blocking_notifier_head *nh,
@@ -134,8 +122,6 @@ extern int blocking_notifier_chain_unregister(struct
blocking_notifier_head *nh,
struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
struct notifier_block *nb);
-extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
- struct notifier_block *nb);
extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
unsigned long val, void *v);
@@ -149,10 +135,6 @@ extern int raw_notifier_call_chain(struct
raw_notifier_head *nh,
unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
unsigned long val, void *v, int nr_to_call, int *nr_calls);
-extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v);
-extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
- unsigned long val, void *v, int nr_to_call, int *nr_calls);
#define NOTIFY_DONE0x /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
@@ -211,5 +193,30 @@ static inline int notifier_to_errno(int ret)
extern struct blocking_notifier_head reboot_notifier_list;
+#ifdef CONFIG_SRCU
+
+struct srcu_notifier_head {
+ struct mutex mutex;
+ struct srcu_struct srcu;
+ struct notifier_block __rcu *head;
+};
+
+/* srcu_notifier_heads must be initialized and cleaned up dynamically
+ * srcu_notifier_heads cannot be initialized statically
+ */
+extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
+#define srcu_cleanup_notifier_head(name) cleanup_srcu_struct((name)-srcu)
+
+extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
+ struct notifier_block *nb);
+extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v);
+extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
+ unsigned long val, void *v, int nr_to_call, int *nr_calls);
+
+#endif /* CONFIG_SRCU */
+
#endif /* __KERNEL__ */
