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| author | Greg Pearson <greg.pearson@hp.com> | 2012-04-25 04:23:56 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-04-25 14:47:08 +0400 |
| commit | ea0dcf903e7d76aa5d483d876215fedcfdfe140f (patch) | |
| tree | b2cf96b9507234e9be759f725349cbe730dd63c6 /arch | |
| parent | d0d3bc65afcdd69bdd3b5bebdf8b3ee3680efa0e (diff) | |
| download | linux-ea0dcf903e7d76aa5d483d876215fedcfdfe140f.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | 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 8a778db45e3a..991e315f4227 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; } |