linux-kernel - [tip:x86/debug] x86-64: Fix CFI data for common

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Message-ID: <tip-928282e432ee584129a39da831ffa72c38e189b7@git.kernel.org>
Date:	Mon, 27 Feb 2012 04:08:23 -0800
From:	tip-bot for Mark Wielaard <mjw@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	jbeulich@...e.com, mjw@...hat.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/debug] x86-64: Fix CFI data for common_interrupt()

Commit-ID:  928282e432ee584129a39da831ffa72c38e189b7
Gitweb:     http://git.kernel.org/tip/928282e432ee584129a39da831ffa72c38e189b7
Author:     Mark Wielaard <mjw@...hat.com>
AuthorDate: Fri, 24 Feb 2012 11:32:05 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 27 Feb 2012 10:46:14 +0100

x86-64: Fix CFI data for common_interrupt()

Commit eab9e6137f23 ("x86-64: Fix CFI data for interrupt frames")
introduced a DW_CFA_def_cfa_expression in the SAVE_ARGS_IRQ
macro. To later define the CFA using a simple register+offset
rule both register and offset need to be supplied. Just using
CFI_DEF_CFA_REGISTER leaves the offset undefined. So use
CFI_DEF_CFA with reg+off explicitly at the end of
common_interrupt.

Signed-off-by: Mark Wielaard <mjw@...hat.com>
Acked-by: Jan Beulich <jbeulich@...e.com>
Link: http://lkml.kernel.org/r/1330079527-30711-1-git-send-email-mjw@redhat.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/entry_64.S |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 3fe8239..54be36b 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -813,7 +813,7 @@ ret_from_intr:
 
 	/* Restore saved previous stack */
 	popq %rsi
-	CFI_DEF_CFA_REGISTER	rsi
+	CFI_DEF_CFA rsi,SS+8-RBP	/* reg/off reset after def_cfa_expr */
 	leaq ARGOFFSET-RBP(%rsi), %rsp
 	CFI_DEF_CFA_REGISTER	rsp
 	CFI_ADJUST_CFA_OFFSET	RBP-ARGOFFSET
--
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