Re: [Intel-gfx] [PATCH V2] include: linux: Regularise the use of FIELD_SIZEOF macro
Hi Kees,
Cc'ing William Kucharski,
> On Wed, Jun 12, 2019 at 01:08:36AM +0530, Shyam Saini wrote:
> > In favour of FIELD_SIZEOF, this patch also deprecates other two similar
> > macros sizeof_field and SIZEOF_FIELD.
> >
> > For code compatibility reason, retain sizeof_field macro as a wrapper macro
> > to FIELD_SIZEOF
>
> Can you explain this part? First sentence says you want to remove
> sizeof_field, and the second says you're keeping it? I thought the point
> was to switch all of these to FIELD_SIZEOF()?
Previously, William [1] suggested to retain sizeof_field as macro to
FIELD_SIZEOF
for code compatibility reason. I have removed all the usage of
sizeof_field apart from retained
wrapper macro definition.
[1] https://patchwork.ozlabs.org/patch/1085275/
Thanks,
Shyam
> >
> > arch/arm64/include/asm/processor.h | 10 +-
> > arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 9 +
> > drivers/gpu/drm/i915/gvt/scheduler.c | 2 +-
> > drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++--
> > fs/befs/linuxvfs.c | 2 +-
> > fs/ext2/super.c| 2 +-
> > fs/ext4/super.c| 2 +-
> > fs/freevxfs/vxfs_super.c | 2 +-
> > fs/orangefs/super.c| 2 +-
> > fs/ufs/super.c | 2 +-
> > include/linux/kernel.h | 9 -
> > include/linux/slab.h | 2 +-
> > include/linux/stddef.h | 17 ++---
> > kernel/fork.c | 2 +-
> > kernel/utsname.c | 2 +-
> > net/caif/caif_socket.c | 2 +-
> > net/core/skbuff.c | 2 +-
> > net/ipv4/raw.c | 2 +-
> > net/ipv6/raw.c | 2 +-
> > net/sctp/socket.c | 4 ++--
> > tools/testing/selftests/bpf/bpf_util.h | 22
> > +++---
> > virt/kvm/kvm_main.c| 2 +-
> > 22 files changed, 58 insertions(+), 47 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/processor.h
> > b/arch/arm64/include/asm/processor.h
> > index fcd0e691b1ea..ace906d887cc 100644
> > --- a/arch/arm64/include/asm/processor.h
> > +++ b/arch/arm64/include/asm/processor.h
> > @@ -164,13 +164,13 @@ static inline void
> > arch_thread_struct_whitelist(unsigned long *offset,
> > unsigned long *size)
> > {
> > /* Verify that there is no padding among the whitelisted fields: */
> > - BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) !=
> > - sizeof_field(struct thread_struct, uw.tp_value) +
> > - sizeof_field(struct thread_struct, uw.tp2_value) +
> > - sizeof_field(struct thread_struct, uw.fpsimd_state));
> > + BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) !=
> > + FIELD_SIZEOF(struct thread_struct, uw.tp_value) +
> > + FIELD_SIZEOF(struct thread_struct, uw.tp2_value) +
> > + FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state));
> >
> > *offset = offsetof(struct thread_struct, uw);
> > - *size = sizeof_field(struct thread_struct, uw);
> > + *size = FIELD_SIZEOF(struct thread_struct, uw);
> > }
> >
> > #ifdef CONFIG_COMPAT
> > diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > index ba8f82a29a81..44b506a14666 100644
> > --- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > +++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
> > @@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
> > /* See header file for descriptions of functions */
> >
> > /**
> > - * This macro returns the size of a member of a structure.
> > - * Logically it is the same as "sizeof(s::field)" in C++, but
> > - * C lacks the "::" operator.
> > - */
> > -#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field)
> > -
> > -/**
> > * This macro returns a member of the
> > * cvmx_bootmem_named_block_desc_t structure. These members can't
> > * be directly addressed as they might be in memory not directly
> > @@ -65,7 +58,7 @@ static struct
Re: [Intel-gfx] [PATCH V2] include: linux: Regularise the use of FIELD_SIZEOF macro
Hi Andrew, > > On Tue, 11 Jun 2019 15:00:10 -0600 Andreas Dilger wrote: > > > >> to FIELD_SIZEOF > > > > > > As Alexey has pointed out, C structs and unions don't have fields - > > > they have members. So this is an opportunity to switch everything to > > > a new member_sizeof(). > > > > > > What do people think of that and how does this impact the patch footprint? > > > > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field() > > is about 30x, and SIZEOF_FIELD() is only about 5x. > > Erk. Sorry, I should have grepped. > > > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()" > > than FIELD_SIZEOF(). Not only does that better match "offsetof()", with > > which it is closely related, but is also closer to the original "sizeof()". > > > > Since this is a rather trivial change, it can be split into a number of > > patches to get approval/landing via subsystem maintainers, and there is no > > huge urgency to remove the original macros until the users are gone. It > > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so > > they don't gain more users, and the remaining FIELD_SIZEOF() users can be > > whittled away as the patches come through the maintainer trees. > > In that case I'd say let's live with FIELD_SIZEOF() and remove > sizeof_field() and SIZEOF_FIELD(). > > I'm a bit surprised that the FIELD_SIZEOF() definition ends up in > stddef.h rather than in kernel.h where such things are normally > defined. Why is that? Thanks for pointing out this, I was not aware if this is a convention. Anyway, I'll keep FIELD_SIZEOF definition in kernel.h in next version. ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
[Intel-gfx] [PATCH V2] include: linux: Regularise the use of FIELD_SIZEOF macro
Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD
and FIELD_SIZEOF which are used to calculate the size of a member of
structure, so to bring uniformity in entire kernel source tree lets use
FIELD_SIZEOF and replace all occurrences of other two macros with this.
For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and
tools/testing/selftests/bpf/bpf_util.h and remove its defination from
include/linux/kernel.h
In favour of FIELD_SIZEOF, this patch also deprecates other two similar
macros sizeof_field and SIZEOF_FIELD.
For code compatibility reason, retain sizeof_field macro as a wrapper macro
to FIELD_SIZEOF
Signed-off-by: Shyam Saini
---
Changelog:
V1->V2
- Consolidate previous patch 1 and 2 into single patch
- For code compatibility reason, retain sizeof_field macro as a
wrapper macro to FIELD_SIZEOF
arch/arm64/include/asm/processor.h | 10 +-
arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 9 +
drivers/gpu/drm/i915/gvt/scheduler.c | 2 +-
drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++--
fs/befs/linuxvfs.c | 2 +-
fs/ext2/super.c| 2 +-
fs/ext4/super.c| 2 +-
fs/freevxfs/vxfs_super.c | 2 +-
fs/orangefs/super.c| 2 +-
fs/ufs/super.c | 2 +-
include/linux/kernel.h | 9 -
include/linux/slab.h | 2 +-
include/linux/stddef.h | 17 ++---
kernel/fork.c | 2 +-
kernel/utsname.c | 2 +-
net/caif/caif_socket.c | 2 +-
net/core/skbuff.c | 2 +-
net/ipv4/raw.c | 2 +-
net/ipv6/raw.c | 2 +-
net/sctp/socket.c | 4 ++--
tools/testing/selftests/bpf/bpf_util.h | 22 +++---
virt/kvm/kvm_main.c| 2 +-
22 files changed, 58 insertions(+), 47 deletions(-)
diff --git a/arch/arm64/include/asm/processor.h
b/arch/arm64/include/asm/processor.h
index fcd0e691b1ea..ace906d887cc 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -164,13 +164,13 @@ static inline void arch_thread_struct_whitelist(unsigned
long *offset,
unsigned long *size)
{
/* Verify that there is no padding among the whitelisted fields: */
- BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) !=
-sizeof_field(struct thread_struct, uw.tp_value) +
-sizeof_field(struct thread_struct, uw.tp2_value) +
-sizeof_field(struct thread_struct, uw.fpsimd_state));
+ BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) !=
+FIELD_SIZEOF(struct thread_struct, uw.tp_value) +
+FIELD_SIZEOF(struct thread_struct, uw.tp2_value) +
+FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state));
*offset = offsetof(struct thread_struct, uw);
- *size = sizeof_field(struct thread_struct, uw);
+ *size = FIELD_SIZEOF(struct thread_struct, uw);
}
#ifdef CONFIG_COMPAT
diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
index ba8f82a29a81..44b506a14666 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
@@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
/* See header file for descriptions of functions */
/**
- * This macro returns the size of a member of a structure.
- * Logically it is the same as "sizeof(s::field)" in C++, but
- * C lacks the "::" operator.
- */
-#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field)
-
-/**
* This macro returns a member of the
* cvmx_bootmem_named_block_desc_t structure. These members can't
* be directly addressed as they might be in memory not directly
@@ -65,7 +58,7 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
#define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \
__cvmx_bootmem_desc_get(addr, \
offsetof(struct cvmx_bootmem_named_block_desc, field), \
- SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field))
+ FIELD_SIZEOF(struct cvmx_bootmem_named_block_desc, field))
/**
* This function is the implementation of the get macros defined
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c
b/drivers/gpu/drm/i915/gvt/scheduler.c
index 0f919f0a43d4..820f95a52542 100644
--- a/drivers/gpu/drm/i915/gvt
Re: [Intel-gfx] [PATCH 1/2] include: linux: Regularise the use of FIELD_SIZEOF macro
Hi William,
Sorry for the late reply.
> > Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD
> > and FIELD_SIZEOF which are used to calculate the size of a member of
> > structure, so to bring uniformity in entire kernel source tree lets use
> > FIELD_SIZEOF and replace all occurrences of other two macros with this.
> >
> > For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and
> > tools/testing/selftests/bpf/bpf_util.h and remove its defination from
> > include/linux/kernel.h
>
>
> > --- a/include/linux/stddef.h
> > +++ b/include/linux/stddef.h
> > @@ -20,6 +20,15 @@ enum {
> > #endif
> >
> > /**
> > + * FIELD_SIZEOF - get the size of a struct's field
> > + * @t: the target struct
> > + * @f: the target struct's field
> > + * Return: the size of @f in the struct definition without having a
> > + * declared instance of @t.
> > + */
> > +#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f))
> > +
> > +/**
> > * sizeof_field(TYPE, MEMBER)
> > *
> > * @TYPE: The structure containing the field of interest
> > @@ -34,6 +43,6 @@ enum {
> > * @MEMBER: The member within the structure to get the end offset of
> > */
> > #define offsetofend(TYPE, MEMBER) \
> > - (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
> > + (offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER))
>
> If you're doing this, why are you leaving the definition of sizeof_field() in
> stddef.h untouched?
I have removed definition of sizeof_field in [1/2] patch.
> Given the way this has worked historically, if you are leaving it in place for
> source compatibility reasons, shouldn't it be redefined in terms of
> FIELD_SIZEOF(), e.g.:
>
> #define sizeof_field(TYPE, MEMBER) FIELD_SIZEOF(TYPE, MEMBER)
Actually, never thought this way. So,Thanks a lot for this valuable feedback.
I'll re-spin and post again.
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[Intel-gfx] [PATCH 2/2] include: linux: Remove unused macros and their defination
In favour of FIELD_SIZEOF, lets deprecate other two similar macros
sizeof_field and SIZEOF_FIELD, and remove them completely.
Signed-off-by: Shyam Saini
---
arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 7 ---
include/linux/stddef.h | 8
tools/testing/selftests/bpf/bpf_util.h | 4
3 files changed, 19 deletions(-)
diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
index fc754d155002..44b506a14666 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
@@ -45,13 +45,6 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
/* See header file for descriptions of functions */
/**
- * This macro returns the size of a member of a structure.
- * Logically it is the same as "sizeof(s::field)" in C++, but
- * C lacks the "::" operator.
- */
-#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field)
-
-/**
* This macro returns a member of the
* cvmx_bootmem_named_block_desc_t structure. These members can't
* be directly addressed as they might be in memory not directly
diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 63f2302bc406..b888eb7795a1 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -29,14 +29,6 @@ enum {
#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f))
/**
- * sizeof_field(TYPE, MEMBER)
- *
- * @TYPE: The structure containing the field of interest
- * @MEMBER: The field to return the size of
- */
-#define sizeof_field(TYPE, MEMBER) sizeofTYPE *)0)->MEMBER))
-
-/**
* offsetofend(TYPE, MEMBER)
*
* @TYPE: The type of the structure
diff --git a/tools/testing/selftests/bpf/bpf_util.h
b/tools/testing/selftests/bpf/bpf_util.h
index 2e90a4315b55..815e7b48fa37 100644
--- a/tools/testing/selftests/bpf/bpf_util.h
+++ b/tools/testing/selftests/bpf/bpf_util.h
@@ -67,10 +67,6 @@ static inline unsigned int bpf_num_possible_cpus(void)
*/
#define FIELD_SIZEOF(t, f) (sizeof(((t *)0)->f))
-#ifndef sizeof_field
-#define sizeof_field(TYPE, MEMBER) sizeofTYPE *)0)->MEMBER))
-#endif
-
#ifndef offsetofend
#define offsetofend(TYPE, MEMBER) \
(offsetof(TYPE, MEMBER) + FIELD_SIZEOF(TYPE, MEMBER))
--
2.11.0
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[Intel-gfx] [PATCH 1/2] include: linux: Regularise the use of FIELD_SIZEOF macro
Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD
and FIELD_SIZEOF which are used to calculate the size of a member of
structure, so to bring uniformity in entire kernel source tree lets use
FIELD_SIZEOF and replace all occurrences of other two macros with this.
For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and
tools/testing/selftests/bpf/bpf_util.h and remove its defination from
include/linux/kernel.h
Signed-off-by: Shyam Saini
---
arch/arm64/include/asm/processor.h | 10 +-
arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 2 +-
drivers/gpu/drm/i915/gvt/scheduler.c | 2 +-
drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++--
fs/befs/linuxvfs.c | 2 +-
fs/ext2/super.c| 2 +-
fs/ext4/super.c| 2 +-
fs/freevxfs/vxfs_super.c | 2 +-
fs/orangefs/super.c| 2 +-
fs/ufs/super.c | 2 +-
include/linux/kernel.h | 9 -
include/linux/slab.h | 2 +-
include/linux/stddef.h | 11 ++-
kernel/fork.c | 2 +-
kernel/utsname.c | 2 +-
net/caif/caif_socket.c | 2 +-
net/core/skbuff.c | 2 +-
net/ipv4/raw.c | 2 +-
net/ipv6/raw.c | 2 +-
net/sctp/socket.c | 4 ++--
tools/testing/selftests/bpf/bpf_util.h | 11 ++-
virt/kvm/kvm_main.c| 2 +-
22 files changed, 45 insertions(+), 36 deletions(-)
diff --git a/arch/arm64/include/asm/processor.h
b/arch/arm64/include/asm/processor.h
index 5d9ce62bdebd..79141eb2c673 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -156,13 +156,13 @@ static inline void arch_thread_struct_whitelist(unsigned
long *offset,
unsigned long *size)
{
/* Verify that there is no padding among the whitelisted fields: */
- BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) !=
-sizeof_field(struct thread_struct, uw.tp_value) +
-sizeof_field(struct thread_struct, uw.tp2_value) +
-sizeof_field(struct thread_struct, uw.fpsimd_state));
+ BUILD_BUG_ON(FIELD_SIZEOF(struct thread_struct, uw) !=
+FIELD_SIZEOF(struct thread_struct, uw.tp_value) +
+FIELD_SIZEOF(struct thread_struct, uw.tp2_value) +
+FIELD_SIZEOF(struct thread_struct, uw.fpsimd_state));
*offset = offsetof(struct thread_struct, uw);
- *size = sizeof_field(struct thread_struct, uw);
+ *size = FIELD_SIZEOF(struct thread_struct, uw);
}
#ifdef CONFIG_COMPAT
diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
index ba8f82a29a81..fc754d155002 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
@@ -65,7 +65,7 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
#define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \
__cvmx_bootmem_desc_get(addr, \
offsetof(struct cvmx_bootmem_named_block_desc, field), \
- SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field))
+ FIELD_SIZEOF(struct cvmx_bootmem_named_block_desc, field))
/**
* This function is the implementation of the get macros defined
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c
b/drivers/gpu/drm/i915/gvt/scheduler.c
index 05b953793316..6b344ff7c1f8 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -1206,7 +1206,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
sizeof(struct
intel_vgpu_workload), 0,
SLAB_HWCACHE_ALIGN,
offsetof(struct
intel_vgpu_workload, rb_tail),
- sizeof_field(struct
intel_vgpu_workload, rb_tail),
+ FIELD_SIZEOF(struct
intel_vgpu_workload, rb_tail),
NULL);
if (!s->workloads) {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
index 46baf3b44309..c0447bf07fbb 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fi
Re: [Intel-gfx] [PATCH 1/2] include: linux: Regularise the use of FIELD_SIZEOF macro
Hi, On Mon, Apr 15, 2019 at 11:13 AM Alexei Starovoitov wrote: > > On Sun, Apr 14, 2019 at 2:15 AM Shyam Saini > wrote: > > > > Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD > > and FIELD_SIZEOF which are used to calculate the size of a member of > > structure, so to bring uniformity in entire kernel source tree lets use > > FIELD_SIZEOF and replace all occurrences of other two macros with this. > > > > For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and > > tools/testing/selftests/bpf/bpf_util.h and remove its defination from > > include/linux/kernel.h > > > > Signed-off-by: Shyam Saini > > --- > > arch/arm64/include/asm/processor.h | 10 +- > > arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 2 +- > > drivers/gpu/drm/i915/gvt/scheduler.c | 2 +- > > drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 4 ++-- > > fs/befs/linuxvfs.c | 2 +- > > fs/ext2/super.c| 2 +- > > fs/ext4/super.c| 2 +- > > fs/freevxfs/vxfs_super.c | 2 +- > > fs/orangefs/super.c| 2 +- > > fs/ufs/super.c | 2 +- > > include/linux/kernel.h | 9 - > > include/linux/slab.h | 2 +- > > include/linux/stddef.h | 11 ++- > > kernel/fork.c | 2 +- > > kernel/utsname.c | 2 +- > > net/caif/caif_socket.c | 2 +- > > net/core/skbuff.c | 2 +- > > net/ipv4/raw.c | 2 +- > > net/ipv6/raw.c | 2 +- > > net/sctp/socket.c | 4 ++-- > > tools/testing/selftests/bpf/bpf_util.h | 11 ++- > > tools/ directory is for user space pieces that don't include kernel's include. > I bet your pathes break the user space builds. I think it shouldn't because I haven't included any kernel header in tool/ files, instead I have introduced definition of macro in tool/ , so this patch doesn't create any dependency on kernel headers. Thanks a lot, Shyam ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
