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    Subject[ 042/153] x86/apic: Use x2apic physical mode based on FADT setting
    3.2-stable review patch.  If anyone has any objections, please let me know.

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

    From: Greg Pearson <greg.pearson@hp.com>

    commit ea0dcf903e7d76aa5d483d876215fedcfdfe140f upstream.

    Provide systems that do not support x2apic cluster mode
    a mechanism to select x2apic physical mode using the
    FADT FORCE_APIC_PHYSICAL_DESTINATION_MODE bit.

    Changes from v1: (based on Suresh's comments)
    - removed #ifdef CONFIG_ACPI
    - removed #include <linux/acpi.h>

    Signed-off-by: Greg Pearson <greg.pearson@hp.com>
    Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
    Link: http://lkml.kernel.org/r/1335313436-32020-1-git-send-email-greg.pearson@hp.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    arch/x86/kernel/apic/x2apic_phys.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/arch/x86/kernel/apic/x2apic_phys.c
    +++ b/arch/x86/kernel/apic/x2apic_phys.c
    @@ -24,6 +24,12 @@ static int x2apic_acpi_madt_oem_check(ch
    {
    if (x2apic_phys)
    return x2apic_enabled();
    + else if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
    + (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL) &&
    + x2apic_enabled()) {
    + printk(KERN_DEBUG "System requires x2apic physical mode\n");
    + return 1;
    + }
    else
    return 0;
    }



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