Re: [PATCH 3/4] powerpc/64: make buildable without CONFIG_COMPAT
On Tue, 27 Aug 2019 22:21:08 +0200
Michal Suchanek wrote:
> There are numerous references to 32bit functions in generic and 64bit
> code so ifdef them out.
>
> Signed-off-by: Michal Suchanek
> ---
> arch/powerpc/include/asm/syscall.h | 2 ++
> arch/powerpc/kernel/Makefile | 15 ---
> arch/powerpc/kernel/entry_64.S | 2 ++
> arch/powerpc/kernel/signal.c | 5 +++--
> arch/powerpc/kernel/syscall_64.c | 5 +++--
> arch/powerpc/kernel/vdso.c | 4 +++-
> arch/powerpc/perf/callchain.c | 14 ++
> 7 files changed, 35 insertions(+), 12 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/syscall.h
> b/arch/powerpc/include/asm/syscall.h
> index 38d62acfdce7..3ed3b75541a1 100644
> --- a/arch/powerpc/include/asm/syscall.h
> +++ b/arch/powerpc/include/asm/syscall.h
> @@ -16,7 +16,9 @@
>
> /* ftrace syscalls requires exporting the sys_call_table */
> extern const unsigned long sys_call_table[];
> +#ifdef CONFIG_COMPAT
> extern const unsigned long compat_sys_call_table[];
> +#endif
>
> static inline int syscall_get_nr(struct task_struct *task, struct pt_regs
> *regs)
> {
> diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
> index 1d646a94d96c..b0db365b83d8 100644
> --- a/arch/powerpc/kernel/Makefile
> +++ b/arch/powerpc/kernel/Makefile
> @@ -44,16 +44,25 @@ CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING
> endif
>
> obj-y:= cputable.o ptrace.o syscalls.o \
> -irq.o align.o signal_32.o pmc.o vdso.o \
> +irq.o align.o pmc.o vdso.o \
> process.o systbl.o idle.o \
> signal.o sysfs.o cacheinfo.o time.o \
> prom.o traps.o setup-common.o \
> udbg.o misc.o io.o misc_$(BITS).o \
> of_platform.o prom_parse.o
> -obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \
> -signal_64.o ptrace32.o \
> +ifndef CONFIG_PPC64
> +obj-y+= signal_32.o
> +else
> +ifdef CONFIG_COMPAT
> +obj-y+= signal_32.o
> +endif
> +endif
> +obj-$(CONFIG_PPC64) += setup_64.o signal_64.o \
> paca.o nvram_64.o firmware.o \
> syscall_64.o
> +ifdef CONFIG_COMPAT
> +obj-$(CONFIG_PPC64) += sys_ppc32.o ptrace32.o
> +endif
> obj-$(CONFIG_VDSO32) += vdso32/
> obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o
> obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
> diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
> index 2ec825a85f5b..a2dbf216f607 100644
> --- a/arch/powerpc/kernel/entry_64.S
> +++ b/arch/powerpc/kernel/entry_64.S
> @@ -51,8 +51,10 @@
> SYS_CALL_TABLE:
> .tc sys_call_table[TC],sys_call_table
>
> +#ifdef CONFIG_COMPAT
> COMPAT_SYS_CALL_TABLE:
> .tc compat_sys_call_table[TC],compat_sys_call_table
> +#endif
>
> /* This value is used to mark exception frames on the stack. */
> exception_marker:
> diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
> index 60436432399f..71f4f1794f86 100644
> --- a/arch/powerpc/kernel/signal.c
> +++ b/arch/powerpc/kernel/signal.c
> @@ -277,14 +277,15 @@ static void do_signal(struct task_struct *tsk)
>
> rseq_signal_deliver(&ksig, tsk->thread.regs);
>
> +#ifdef CONFIG_COMPAT
This is common code so it needs
#if !defined(CONFIG_PPC64) || defined(CONFIG_COMPAT)
> if (is32) {
> if (ksig.ka.sa.sa_flags & SA_SIGINFO)
> ret = handle_rt_signal32(&ksig, oldset, tsk);
> else
> ret = handle_signal32(&ksig, oldset, tsk);
> - } else {
> + } else
> +#endif /* CONFIG_COMPAT */
> ret = handle_rt_signal64(&ksig, oldset, tsk);
> - }
>
> tsk->thread.regs->trap = 0;
> signal_setup_done(ret, &ksig, test_thread_flag(TIF_SINGLESTEP));
> diff --git a/arch/powerpc/kernel/syscall_64.c
> b/arch/powerpc/kernel/syscall_64.c
> index 98ed970796d5..3f48262b512d 100644
> --- a/arch/powerpc/kernel/syscall_64.c
> +++ b/arch/powerpc/kernel/syscall_64.c
> @@ -100,6 +100,7 @@ long system_call_exception(long r3, long r4, long r5,
> long r6, long r7, long r8,
> /* May be faster to do array_index_nospec? */
> barrier_nospec();
>
> +#ifdef CONFIG_COMPAT
> if (unlikely(ti_flags & _TIF_32BIT)) {
> f = (void *)compat_sys_call_table[r0];
>
> @@ -110,9 +111,9 @@ long system_call_exception(long r3, long r4, long r5,
> long r6, long r7, long r8,
> r7 &= 0xULL;
> r8 &= 0xULL;
>
> - } else {
> + } else
> +#endif /* CONFIG_COMPAT */
> f = (void *)sys_call_table[r0];
> - }
>
> return f(r3, r4, r5, r6, r7, r8);
>
[PATCH 3/4] powerpc/64: make buildable without CONFIG_COMPAT
There are numerous references to 32bit functions in generic and 64bit
code so ifdef them out.
Signed-off-by: Michal Suchanek
---
arch/powerpc/include/asm/syscall.h | 2 ++
arch/powerpc/kernel/Makefile | 15 ---
arch/powerpc/kernel/entry_64.S | 2 ++
arch/powerpc/kernel/signal.c | 5 +++--
arch/powerpc/kernel/syscall_64.c | 5 +++--
arch/powerpc/kernel/vdso.c | 4 +++-
arch/powerpc/perf/callchain.c | 14 ++
7 files changed, 35 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/include/asm/syscall.h
b/arch/powerpc/include/asm/syscall.h
index 38d62acfdce7..3ed3b75541a1 100644
--- a/arch/powerpc/include/asm/syscall.h
+++ b/arch/powerpc/include/asm/syscall.h
@@ -16,7 +16,9 @@
/* ftrace syscalls requires exporting the sys_call_table */
extern const unsigned long sys_call_table[];
+#ifdef CONFIG_COMPAT
extern const unsigned long compat_sys_call_table[];
+#endif
static inline int syscall_get_nr(struct task_struct *task, struct pt_regs
*regs)
{
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 1d646a94d96c..b0db365b83d8 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -44,16 +44,25 @@ CFLAGS_btext.o += -DDISABLE_BRANCH_PROFILING
endif
obj-y := cputable.o ptrace.o syscalls.o \
- irq.o align.o signal_32.o pmc.o vdso.o \
+ irq.o align.o pmc.o vdso.o \
process.o systbl.o idle.o \
signal.o sysfs.o cacheinfo.o time.o \
prom.o traps.o setup-common.o \
udbg.o misc.o io.o misc_$(BITS).o \
of_platform.o prom_parse.o
-obj-$(CONFIG_PPC64)+= setup_64.o sys_ppc32.o \
- signal_64.o ptrace32.o \
+ifndef CONFIG_PPC64
+obj-y += signal_32.o
+else
+ifdef CONFIG_COMPAT
+obj-y += signal_32.o
+endif
+endif
+obj-$(CONFIG_PPC64)+= setup_64.o signal_64.o \
paca.o nvram_64.o firmware.o \
syscall_64.o
+ifdef CONFIG_COMPAT
+obj-$(CONFIG_PPC64)+= sys_ppc32.o ptrace32.o
+endif
obj-$(CONFIG_VDSO32) += vdso32/
obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2ec825a85f5b..a2dbf216f607 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -51,8 +51,10 @@
SYS_CALL_TABLE:
.tc sys_call_table[TC],sys_call_table
+#ifdef CONFIG_COMPAT
COMPAT_SYS_CALL_TABLE:
.tc compat_sys_call_table[TC],compat_sys_call_table
+#endif
/* This value is used to mark exception frames on the stack. */
exception_marker:
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 60436432399f..71f4f1794f86 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -277,14 +277,15 @@ static void do_signal(struct task_struct *tsk)
rseq_signal_deliver(&ksig, tsk->thread.regs);
+#ifdef CONFIG_COMPAT
if (is32) {
if (ksig.ka.sa.sa_flags & SA_SIGINFO)
ret = handle_rt_signal32(&ksig, oldset, tsk);
else
ret = handle_signal32(&ksig, oldset, tsk);
- } else {
+ } else
+#endif /* CONFIG_COMPAT */
ret = handle_rt_signal64(&ksig, oldset, tsk);
- }
tsk->thread.regs->trap = 0;
signal_setup_done(ret, &ksig, test_thread_flag(TIF_SINGLESTEP));
diff --git a/arch/powerpc/kernel/syscall_64.c b/arch/powerpc/kernel/syscall_64.c
index 98ed970796d5..3f48262b512d 100644
--- a/arch/powerpc/kernel/syscall_64.c
+++ b/arch/powerpc/kernel/syscall_64.c
@@ -100,6 +100,7 @@ long system_call_exception(long r3, long r4, long r5, long
r6, long r7, long r8,
/* May be faster to do array_index_nospec? */
barrier_nospec();
+#ifdef CONFIG_COMPAT
if (unlikely(ti_flags & _TIF_32BIT)) {
f = (void *)compat_sys_call_table[r0];
@@ -110,9 +111,9 @@ long system_call_exception(long r3, long r4, long r5, long
r6, long r7, long r8,
r7 &= 0xULL;
r8 &= 0xULL;
- } else {
+ } else
+#endif /* CONFIG_COMPAT */
f = (void *)sys_call_table[r0];
- }
return f(r3, r4, r5, r6, r7, r8);
}
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index d60598113a9f..2ab9327e44c4 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -667,7 +667,7 @@ static void __init vdso_setup_syscall_map(void)
{
unsigned int i;
extern unsigned long *sys_call_table;
-#ifdef CONFIG_PP
