diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c
index 16dbc41..fa34a06 100644
--- a/arch/i386/kernel/cpu/amd.c
+++ b/arch/i386/kernel/cpu/amd.c
@@ -24,9 +24,6 @@
 
 static void __init init_amd(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_X86_SMP
-	int cpu = c == &boot_cpu_data ? 0 : c - cpu_data;
-#endif
 	u32 l, h;
 	int mbytes = num_physpages >> (20-PAGE_SHIFT);
 	int r;
@@ -205,7 +202,9 @@
 	 * of two.
 	 */
 	if (c->x86_num_cores > 1) {
-		cpu_core_id[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
+		int cpu = smp_processor_id();
+		/* Fix up the APIC ID following AMD specifications. */
+		cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
 		printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
 		       cpu, c->x86_num_cores, cpu_core_id[cpu]);
 	}
diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 6be0310..11e6e6f 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -243,6 +243,13 @@
 	}
 
 	early_intel_workaround(c);
+
+#ifdef CONFIG_SMP
+#ifdef CONFIG_X86_HT
+	phys_proc_id[smp_processor_id()] =
+#endif
+	cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
+#endif
 }
 
 void __init generic_identify(struct cpuinfo_x86 * c)