This is a note to let you know that I've just added the patch titled
x86, AMD: Fix ARAT feature setting again
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-arat-feature-setting-again.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 14fb57dccb6e1defe9f89a66f548fcb24c374c1d Mon Sep 17 00:00:00 2001
From: Borislav Petkov <[email protected]>
Date: Tue, 17 May 2011 14:55:19 +0200
Subject: x86, AMD: Fix ARAT feature setting again
From: Borislav Petkov <[email protected]>
commit 14fb57dccb6e1defe9f89a66f548fcb24c374c1d upstream.
Trying to enable the local APIC timer on early K8 revisions
uncovers a number of other issues with it, in conjunction with
the C1E enter path on AMD. Fixing those causes much more churn
and troubles than the benefit of using that timer brings so
don't enable it on K8 at all, falling back to the original
functionality the kernel had wrt to that.
Reported-and-bisected-by: Nick Bowler <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: Andreas Herrmann <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Hans Rosenfeld <[email protected]>
Cc: Nick Bowler <[email protected]>
Cc: Joerg-Volker-Peetz <[email protected]>
Signed-off-by: Borislav Petkov <[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
@@ -596,7 +596,7 @@ static void __cpuinit init_amd(struct cp
#endif
/* As a rule processors have APIC timer running in deep C states */
- if (c->x86 >= 0xf && !cpu_has_amd_erratum(amd_erratum_400))
+ if (c->x86 > 0xf && !cpu_has_amd_erratum(amd_erratum_400))
set_cpu_cap(c, X86_FEATURE_ARAT);
/*
Patches currently in stable-queue which might be from [email protected]
are
queue-2.6.38/x86-amd-fix-arat-feature-setting-again.patch
queue-2.6.38/x86-mce-amd-fix-leaving-freed-data-in-a-list.patch
queue-2.6.38/revert-x86-amd-fix-apic-timer-erratum-400-affecting-k8-rev.a-e-processors.patch
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