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    Subject[132/151] ACPI: Use the ARB_DISABLE for the CPU which model id is less than 0x0f.
    2.6.32-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Zhao Yakui <yakui.zhao@intel.com>

    commit 03a05ed1152944000151d57b71000de287a1eb02 upstream.

    Currently, ARB_DISABLE is a NOP on all of the recent Intel platforms.
    For such platforms, reduce contention on c3_lock by skipping the fake
    ARB_DISABLE.

    The cpu model id on one laptop is 14. If we disable ARB_DISABLE on this box,
    the box can't be booted correctly. But if we still enable ARB_DISABLE on this
    box, the box can be booted correctly.

    So we still use the ARB_DISABLE for the cpu which mode id is less than 0x0f.

    http://bugzilla.kernel.org/show_bug.cgi?id=14700

    Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
    Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
    Signed-off-by: Len Brown <len.brown@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    arch/x86/kernel/acpi/cstate.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/x86/kernel/acpi/cstate.c
    +++ b/arch/x86/kernel/acpi/cstate.c
    @@ -48,7 +48,7 @@ void acpi_processor_power_init_bm_check(
    * P4, Core and beyond CPUs
    */
    if (c->x86_vendor == X86_VENDOR_INTEL &&
    - (c->x86 > 0xf || (c->x86 == 6 && c->x86_model >= 14)))
    + (c->x86 > 0xf || (c->x86 == 6 && c->x86_model >= 0x0f)))
    flags->bm_control = 0;
    }
    EXPORT_SYMBOL(acpi_processor_power_init_bm_check);



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