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    Subject[PATCH 1/2] Revert "x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors"
    Date
    From: Borislav Petkov <borislav.petkov@amd.com>

    This reverts commit e20a2d205c05cef6b5783df339a7d54adeb50962.

    Moving the lower endpoint of the Erratum 400 check to accomodate earlier
    K8 revisions (A-E) opens a can of worms which is simply not worth to fix
    properly by tweaking the errata checking framework:

    * missing IntPenging MSR on revisions < CG cause #GP:

    http://marc.info/?l=linux-kernel&m=130541471818831

    * makes earlier revisions use the LAPIC timer instead of the C1E idle
    routine which switches to HPET, thus not waking up in deeper C-states:

    http://lkml.org/lkml/2011/4/24/20

    Therefore, leave the original boundary starting with K8-revF.
    ---
    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 bb9eb29..3532d3b 100644
    --- a/arch/x86/kernel/cpu/amd.c
    +++ b/arch/x86/kernel/cpu/amd.c
    @@ -698,7 +698,7 @@ cpu_dev_register(amd_cpu_dev);
    */

    const int amd_erratum_400[] =
    - AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0x0f, 0x4, 0x2, 0xff, 0xf),
    + AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
    AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
    EXPORT_SYMBOL_GPL(amd_erratum_400);

    --
    1.7.4.rc2


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