linux-kernel - [PATCH -rc] [BUGFIX] x86: fix kernel_trap

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Date:	Mon, 11 May 2009 17:03:00 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, systemtap@...rces.redhat.com,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Harvey Harrison <harvey.harrison@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jan Blunck <jblunck@...e.de>,
	Christoph Hellwig <hch@...radead.org>
Subject: [PATCH -rc] [BUGFIX] x86: fix kernel_trap_sp()

Use &regs->sp instead of regs for getting the top of stack in kernel mode.
(on x86-64, regs->sp always points the top of stack)

[ impact: Oprofile decodes only stack for backtracing on i386 ]

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Harvey Harrison <harvey.harrison@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Jan Blunck <jblunck@...e.de>
Cc: Christoph Hellwig <hch@...radead.org>
---

 arch/x86/include/asm/ptrace.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index 5cdd19f..90b76b3 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -187,14 +187,14 @@ static inline int v8086_mode(struct pt_regs *regs)
 
 /*
  * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
- * when it traps.  So regs will be the current sp.
+ * when it traps.  So &regs->sp will be the current sp.
  *
  * This is valid only for kernel mode traps.
  */
 static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
 {
 #ifdef CONFIG_X86_32
-	return (unsigned long)regs;
+	return (unsigned long)&regs->sp;
 #else
 	return regs->sp;
 #endif

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