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    SubjectRe: [PATCH v2 1/1] x86: Use x2apic physical mode based on FADT setting
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    On Tue, 2012-04-24 at 18:23 -0600, Greg Pearson wrote:
    > 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>
    > ---
    > arch/x86/kernel/apic/x2apic_phys.c | 6 ++++++
    > 1 files changed, 6 insertions(+), 0 deletions(-)
    >
    > diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
    > index 8a778db..991e315 100644
    > --- 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(char *oem_id, char *oem_table_id)
    > {
    > 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;
    > }

    Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>



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