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authorJeremy Fitzhardinge <jeremy@goop.org>2009-07-22 09:59:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-07-22 10:06:49 -0700
commit2cb078603abb612e3bcd428fb8122c3d39e08832 (patch)
treef7458972c577287ca6aef610e4bd17957fd35c7d /arch
parent6effa8f6fc786f00e3a23eae605e0f2e8e748faa (diff)
x86, amd: Don't probe for extended APIC ID if APICs are disabled
If we've logically disabled apics, don't probe the PCI space for the AMD extended APIC ID. [ Impact: prevent boot crash under Xen. ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Reported-by: Bastian Blank <bastian@waldi.eu.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/amd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 28e5f595604..e2485b03f1c 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -356,7 +356,7 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
#endif
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI)
/* check CPU config space for extended APIC ID */
- if (c->x86 >= 0xf) {
+ if (cpu_has_apic && c->x86 >= 0xf) {
unsigned int val;
val = read_pci_config(0, 24, 0, 0x68);
if ((val & ((1 << 17) | (1 << 18))) == ((1 << 17) | (1 << 18)))