linux-kernel - [PATCH] [3/4] x86: MCE: Improve mce_get

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Message-Id: <20090407150656.43E161D046D@basil.firstfloor.org>
Date:	Tue,  7 Apr 2009 17:06:56 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	ying.huang@...el.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	mingo@...e.hu, tglx@...utronix.de
Subject: [PATCH] [3/4] x86: MCE: Improve mce_get_rip


From: Huang Ying <ying.huang@...el.com>

Return rip/cs if MCG_STATUS_EIPV is set in mce_get_rip(). Remain m->cs
if RIP is read from rip_msr.

Signed-off-by: Huang Ying <ying.huang@...el.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 arch/x86/kernel/cpu/mcheck/mce_64.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c	2009-04-07 16:09:59.000000000 +0200
+++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c	2009-04-07 16:43:15.000000000 +0200
@@ -175,7 +175,7 @@
 
 static inline void mce_get_rip(struct mce *m, struct pt_regs *regs)
 {
-	if (regs && (m->mcgstatus & MCG_STATUS_RIPV)) {
+	if (regs && (m->mcgstatus & (MCG_STATUS_RIPV | MCG_STATUS_EIPV))) {
 		m->ip = regs->ip;
 		m->cs = regs->cs;
 	} else {
@@ -186,7 +186,6 @@
 		/* Assume the RIP in the MSR is exact. Is this true? */
 		m->mcgstatus |= MCG_STATUS_EIPV;
 		rdmsrl(rip_msr, m->ip);
-		m->cs = 0;
 	}
 }
 
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