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-rw-r--r--arch/x86/kernel/apic_64.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index d8d03e09dea2..7d8ffdaa0ab3 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1180,9 +1180,19 @@ __cpuinit int apic_is_clustered_box(void)
{
int i, clusters, zeros;
unsigned id;
- u16 *bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr;
+ u16 *bios_cpu_apicid;
DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS);
+ /*
+ * there is not this kind of box with AMD CPU yet.
+ * Some AMD box with quadcore cpu and 8 sockets apicid
+ * will be [4, 0x23] or [8, 0x27] could be thought to
+ * have three apic_clusters. So go out early.
+ */
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ return 0;
+
+ bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr;
bitmap_zero(clustermap, NUM_APIC_CLUSTERS);
for (i = 0; i < NR_CPUS; i++) {