linux-kernel - [PATCH 1/2] Revert "x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors"

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Date:	Tue, 17 May 2011 14:55:18 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Nick Bowler <nbowler@...iptictech.com>,
	Jörg-Volker Peetz <jvpeetz@....de>
Cc:	Boris Ostrovsky <boris.ostrovsky@....com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Hans Rosenfeld <hans.rosenfeld@....com>,
	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: [PATCH 1/2] Revert "x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors"

From: Borislav Petkov <borislav.petkov@....com>

This reverts commit e20a2d205c05cef6b5783df339a7d54adeb50962.

Moving the lower endpoint of the Erratum 400 check to accomodate earlier
K8 revisions (A-E) opens a can of worms which is simply not worth to fix
properly by tweaking the errata checking framework:

* missing IntPenging MSR on revisions < CG cause #GP:

http://marc.info/?l=linux-kernel&m=130541471818831

* makes earlier revisions use the LAPIC timer instead of the C1E idle
routine which switches to HPET, thus not waking up in deeper C-states:

http://lkml.org/lkml/2011/4/24/20

Therefore, leave the original boundary starting with K8-revF.
---
 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 bb9eb29..3532d3b 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(0x0f, 0x4, 0x2, 0xff, 0xf),
+	AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
 			    AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
 EXPORT_SYMBOL_GPL(amd_erratum_400);
 
-- 
1.7.4.rc2

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