From 9e46294dadedc0c04adcb8ce760bd2cd74f7332d Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sat, 2 Jul 2011 15:00:52 +0200
Subject: [PATCH 1/2] x86: Save stack pointer in perf live regs savings
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
--
1.7.6