linux-kernel - [PATCH -tip] x86: do_boot_cpu - check if we have ESR register

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Date:	Wed, 22 Oct 2008 18:00:09 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Glauber Costa <glommer@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: [PATCH -tip] x86: do_boot_cpu - check if we have ESR register

We should touch ESR register if only we have it.
The patch fixes the problem mentoined here

	http://lkml.org/lkml/2008/10/17/147

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
CC: Glauber Costa <glommer@...il.com>
---

 arch/x86/kernel/smpboot.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/smpboot.c	2008-10-21 20:35:27.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/smpboot.c	2008-10-22 17:45:28.000000000 +0400
@@ -894,8 +894,10 @@ do_rest:
 		/*
 		 * Be paranoid about clearing APIC errors.
 	 	*/
-		apic_write(APIC_ESR, 0);
-		apic_read(APIC_ESR);
+		if (APIC_INTEGRATED(apic_version[phys_apicid])) {
+			apic_write(APIC_ESR, 0);
+			apic_read(APIC_ESR);
+		}
 	}
 
 	/*
--
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