Commit ea0dcf90 authored Apr 24, 2012 by Greg Pearson Committed by Ingo Molnar Apr 25, 2012

x86/apic: Use x2apic physical mode based on FADT setting



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>

parent d0d3bc65

arch/x86/kernel/apic/x2apic_phys.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}