linux-kernel - [PATCH] [78/106] x86, cpu: Fix regression in AMD errata checking code

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Date:	Tue, 26 Apr 2011 14:13:59 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	hans.rosenfeld@....com, ak@...ux.intel.com, hpa@...or.com,
	gregkh@...e.de, linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [78/106] x86, cpu: Fix regression in AMD errata checking code

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Hans Rosenfeld <hans.rosenfeld@....com>

commit 07a7795ca2e6e66d00b184efb46bd0e23d90d3fe upstream.

A bug in the family-model-stepping matching code caused the presence of
errata to go undetected when OSVW was not used. This causes hangs on
some K8 systems because the E400 workaround is not enabled.

Signed-off-by: Hans Rosenfeld <hans.rosenfeld@....com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
LKML-Reference: <1282141190-930137-1-git-send-email-hans.rosenfeld@....com>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/cpu/amd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/arch/x86/kernel/cpu/amd.c
===================================================================
--- linux-2.6.35.y.orig/arch/x86/kernel/cpu/amd.c
+++ linux-2.6.35.y/arch/x86/kernel/cpu/amd.c
@@ -687,7 +687,7 @@ bool cpu_has_amd_erratum(const int *erra
 	}
 
 	/* OSVW unavailable or ID unknown, match family-model-stepping range */
-	ms = (cpu->x86_model << 8) | cpu->x86_mask;
+	ms = (cpu->x86_model << 4) | cpu->x86_mask;
 	while ((range = *erratum++))
 		if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
 		    (ms >= AMD_MODEL_RANGE_START(range)) &&
--
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