diff options
authorBoris Ostrovsky <ostr@amd64.org>2011-04-29 17:47:43 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-09 15:06:45 -0700
commit15f0758f185241ad9c358a5bf60ff0a21eccc218 (patch)
parent18ab890cdc1e014d2ced35a5b8e606871ed5e6fc (diff)
x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors
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 <jvpeetz@web.de> Tested-by: Joerg-Volker Peetz <jvpeetz@web.de> Acked-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Boris Ostrovsky <Boris.Ostrovsky@amd.com> Link: http://lkml.kernel.org/r/1304113663-6586-1-git-send-email-ostr@amd64.org Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index a2b9c7d4132..b65c707716f 100644
--- 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));