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x86/x2apic: Acpi_gbl_FADT existence depends on CONFIG_ACPI

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If ACPI is disabled, acpi_gbl_FADT is not available, and and the build
breaks.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: http://lkml.kernel.org/r/55479708.2000104@siemens.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jan Kiszka 2015-05-04 17:58:00 +02:00 committed by Thomas Gleixner
parent eb18cf55c2
commit 781674fc33
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kernel/apic/x2apic_phys.c
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@ -21,11 +21,13 @@ early_param("x2apic_phys", set_x2apic_phys_mode);
static bool x2apic_fadt_phys(void)
{
#ifdef CONFIG_ACPI
if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
printk(KERN_DEBUG "System requires x2apic physical mode\n");
return true;
}
#endif
return false;
}