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x86: Save stack pointer in perf live regs savings

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In order to prepare for fetching the stack pointer from the
regs when possible in dump_trace() instead of taking the
local one, save the current stack pointer in perf live regs saving.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Frederic Weisbecker 2011-07-02 15:00:52 +02:00
parent af07ce3e77
commit 9e46294dad
1 changed files with 5 additions and 0 deletions
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5
arch/x86/include/asm/perf_event.h
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@ -152,6 +152,11 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs);
(regs)->bp = caller_frame_pointer(); \ (regs)->bp = caller_frame_pointer(); \
(regs)->cs = __KERNEL_CS; \ (regs)->cs = __KERNEL_CS; \
regs->flags = 0; \ regs->flags = 0; \
asm volatile( \
_ASM_MOV "%%"_ASM_SP ", %0\n" \
: "=m" ((regs)->sp) \
:: "memory" \
); \
} }
#else #else