Commit-ID: 14fb57dccb6e1defe9f89a66f548fcb24c374c1d Gitweb: http://git.kernel.org/tip/14fb57dccb6e1defe9f89a66f548fcb24c374c1d Author: Borislav Petkov <borislav.petkov@xxxxxxx> AuthorDate: Tue, 17 May 2011 14:55:19 +0200 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Tue, 17 May 2011 15:28:34 +0200 x86, AMD: Fix ARAT feature setting again 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 <nbowler@xxxxxxxxxxxxxxxx> Cc: Boris Ostrovsky <Boris.Ostrovsky@xxxxxxx> Cc: Andreas Herrmann <andreas.herrmann3@xxxxxxx> Cc: Greg Kroah-Hartman <greg@xxxxxxxxx> Cc: Hans Rosenfeld <hans.rosenfeld@xxxxxxx> Cc: Nick Bowler <nbowler@xxxxxxxxxxxxxxxx> Cc: Joerg-Volker-Peetz <jvpeetz@xxxxxx> Signed-off-by: Borislav Petkov <borislav.petkov@xxxxxxx> Link: http://lkml.kernel.org/r/1305636919-31165-3-git-send-email-bp@xxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- arch/x86/kernel/cpu/amd.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 3532d3b..6f9d1f6 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -613,7 +613,7 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c) #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); /* -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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