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Subject[PATCH 1/6] x86: Save stack pointer in perf live regs savings
Date
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>
---
arch/x86/include/asm/perf_event.h | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index d9d4dae..094fb30 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -152,6 +152,11 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs);
(regs)->bp = caller_frame_pointer(); \
(regs)->cs = __KERNEL_CS; \
regs->flags = 0; \
+ asm volatile( \
+ _ASM_MOV "%%"_ASM_SP ", %0\n" \
+ : "=m" ((regs)->sp) \
+ :: "memory" \
+ ); \
}

#else
--
1.7.5.4


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