3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Greg Pearson <greg.pearson@xxxxxx> 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@xxxxxx> Acked-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx> Link: http://lkml.kernel.org/r/1335313436-32020-1-git-send-email-greg.pearson@xxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- 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; } -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html