linux-kernel - Re: [PATCH] [PATCH] x86: Don't clobber top of pt

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Message-ID: <1351864310.4004.130.camel@gandalf.local.home>
Date:	Fri, 02 Nov 2012 09:51:50 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jan Beulich <jbeulich@...e.com>
Cc:	sqazi@...gle.com, peterz@...radead.org, tglx@...utronix.de,
	torvalds@...ux-foundation.org, hpa@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [PATCH] x86: Don't clobber top of pt_regs in nested NMI

On Thu, 2012-11-01 at 19:53 +0000, Jan Beulich wrote:

> There doesn't appear to be anything special about these adjustments, so I
> don't see what help would be required here - it ought to be the normal use
> of CFI_ADJUST_CFA_OFFSET that needs adding.

This change look fine to you?

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 52edf92..7ba5342 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1796,10 +1796,12 @@ repeat_nmi:
 
 	/* Make another copy, this one may be modified by nested NMIs */
 	addq $(10*8), %rsp
+	CFI_ADJUST_CFA_OFFSET -10*8
 	.rept 5
 	pushq_cfi -6*8(%rsp)
 	.endr
 	subq $(5*8), %rsp
+	CFI_ADJUST_CFA_OFFSET 5*8
 
 	CFI_DEF_CFA_OFFSET SS+8-RIP
 end_repeat_nmi:


-- Steve


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