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x86, cpu: Fix regression in AMD errata checking code

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A bug in the family-model-stepping matching code caused the presence of
errata to go undetected when OSVW was not used. This causes hangs on
some K8 systems because the E400 workaround is not enabled.

Signed-off-by: Hans Rosenfeld <hans.rosenfeld@amd.com>
LKML-Reference: <1282141190-930137-1-git-send-email-hans.rosenfeld@amd.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Hans Rosenfeld 2010-08-18 16:19:50 +02:00 committed by H. Peter Anvin
parent da5cabf80e
commit 07a7795ca2
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/cpu/amd.c
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@ -669,7 +669,7 @@ bool cpu_has_amd_erratum(const int *erratum)
}
/* OSVW unavailable or ID unknown, match family-model-stepping range */
ms = (cpu->x86_model << 8) | cpu->x86_mask;
ms = (cpu->x86_model << 4) | cpu->x86_mask;
while ((range = *erratum++))
if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
(ms >= AMD_MODEL_RANGE_START(range)) &&