This is a note to let you know that I've just added the patch titled
x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors
to the 2.6.38-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-amd-fix-apic-timer-erratum-400-affecting-k8-rev.a-e-processors.patch
and it can be found in the queue-2.6.38 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From e20a2d205c05cef6b5783df339a7d54adeb50962 Mon Sep 17 00:00:00 2001
From: Boris Ostrovsky <[email protected]>
Date: Fri, 29 Apr 2011 17:47:43 -0400
Subject: x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors
From: Boris Ostrovsky <[email protected]>
commit e20a2d205c05cef6b5783df339a7d54adeb50962 upstream.
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") where the system may become
unresponsive until external interrupt (such as keyboard input)
occurs. This results, for example, in time not being reported
correctly, lack of progress on the system and other lockups.
Reported-by: Joerg-Volker Peetz <[email protected]>
Tested-by: Joerg-Volker Peetz <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Signed-off-by: Boris Ostrovsky <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/cpu/amd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -681,7 +681,7 @@ 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(0x0f, 0x4, 0x2, 0xff, 0xf),
AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
EXPORT_SYMBOL_GPL(amd_erratum_400);
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.38/x86-amd-fix-apic-timer-erratum-400-affecting-k8-rev.a-e-processors.patch
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