From 48a4dad47e070186217fa19001c850ec8d2d082e Mon Sep 17 00:00:00 2001 From: Hans Rosenfeld Date: Wed, 18 Aug 2010 16:19:50 +0200 Subject: [PATCH] x86, cpu: Fix regression in AMD errata checking code commit 07a7795ca2e6e66d00b184efb46bd0e23d90d3fe upstream. 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 LKML-Reference: <1282141190-930137-1-git-send-email-hans.rosenfeld@amd.com> Signed-off-by: H. Peter Anvin Signed-off-by: Paul Gortmaker --- arch/x86/kernel/cpu/amd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index dba9ca22eb5c..d618dc1e366e 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -688,7 +688,7 @@ 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)) && -- 2.39.5