linux-kernel - [tip:x86/urgent] x86-64: Fix unwind annotations in recent NMI changes

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Date:	Thu, 24 Jan 2013 04:27:00 -0800
From:	tip-bot for Jan Beulich <JBeulich@...e.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, jbeulich@...e.com,
	rostedt@...dmis.org, heukelum@...lshack.com, JBeulich@...e.com,
	tglx@...utronix.de
Subject: [tip:x86/urgent] x86-64:
  Fix unwind annotations in recent NMI changes

Commit-ID:  444723dccc3c855fe88ea138cdec46f30e707b74
Gitweb:     http://git.kernel.org/tip/444723dccc3c855fe88ea138cdec46f30e707b74
Author:     Jan Beulich <JBeulich@...e.com>
AuthorDate: Thu, 24 Jan 2013 09:27:31 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 24 Jan 2013 10:56:32 +0100

x86-64: Fix unwind annotations in recent NMI changes

While in one case a plain annotation is necessary, in the other
case the stack adjustment can simply be folded into the
immediately preceding RESTORE_ALL, thus getting the correct
annotation for free.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Alexander van Heukelum <heukelum@...lshack.com>
Link: http://lkml.kernel.org/r/51010C9302000078000B9045@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/entry_64.S | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 07a7a04..cb3c591 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1781,6 +1781,7 @@ first_nmi:
 	 * Leave room for the "copied" frame
 	 */
 	subq $(5*8), %rsp
+	CFI_ADJUST_CFA_OFFSET 5*8
 
 	/* Copy the stack frame to the Saved frame */
 	.rept 5
@@ -1863,10 +1864,8 @@ end_repeat_nmi:
 nmi_swapgs:
 	SWAPGS_UNSAFE_STACK
 nmi_restore:
-	RESTORE_ALL 8
-
-	/* Pop the extra iret frame */
-	addq $(5*8), %rsp
+	/* Pop the extra iret frame at once */
+	RESTORE_ALL 6*8
 
 	/* Clear the NMI executing stack variable */
 	movq $0, 5*8(%rsp)
--
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