linux-kernel - [PATCH] Subject: [PATCH] x86, AMD: K8 Rev.A-E processors are subject to erratum 400

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Message-Id: <1304106663-3720-1-git-send-email-ostr@amd64.org>
Date:	Fri, 29 Apr 2011 15:51:03 -0400
From:	Boris Ostrovsky <ostr@...64.org>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, jvpeetz@....de,
	borislav.petkov@....com, boris.ostrovsky@....com
Subject: [PATCH] Subject: [PATCH] x86, AMD: K8 Rev.A-E processors are subject to erratum 400

Signed-off-by: Boris Ostrovsky <Boris.Ostrovsky@....com>
Acked-by: Borislav Petkov <borislav.petkov@....com>
Reported-by: Joerg-Volker Peetz <jvpeetz@....de>
Tested-by: Joerg-Volker Peetz <jvpeetz@....de>

Older AMD K8 processors (Revisions A-E) are affected by erratum 400 (APIC timer
interrupts don't occur in C states greater than C1). This, for example, means that
X86_FEATURE_ARAT flag should not be set for these parts.

This addresses regression introduced by commit b87cf80af3ba4b4c008b4face3c68d604e1715c6
(x86, AMD: Set ARAT feature on AMD processors") so it is somewhat high priority.
---
 arch/x86/kernel/cpu/amd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 3532d3b..71499b4 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -698,7 +698,7 @@ cpu_dev_register(amd_cpu_dev);
  */
 
 const int amd_erratum_400[] =
-	AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
+	AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x4, 0x2, 0xff, 0xf),
 			    AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
 EXPORT_SYMBOL_GPL(amd_erratum_400);
 
-- 
1.7.3.4

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