3 files changed, 19 insertions, 20 deletions

diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c
index fa34a06c0d7..73aeaf5a9d4 100644
--- a/arch/i386/kernel/cpu/amd.c
+++ b/arch/i386/kernel/cpu/amd.c
@@ -195,7 +195,7 @@ static void __init init_amd(struct cpuinfo_x86 *c)
 			c->x86_num_cores = 1;
 	}
 
-#ifdef CONFIG_X86_SMP
+#ifdef CONFIG_X86_HT
 	/*
 	 * On a AMD dual core setup the lower bits of the APIC id
 	 * distingush the cores.  Assumes number of cores is a power
@@ -203,8 +203,11 @@ static void __init init_amd(struct cpuinfo_x86 *c)
 	 */
 	if (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);
+		unsigned bits = 0;
+		while ((1 << bits) < c->x86_num_cores)
+			bits++;
+		cpu_core_id[cpu] = phys_proc_id[cpu] & ((1<<bits)-1);
+		phys_proc_id[cpu] >>= bits;
 		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 11e6e6f23fa..d199e525680 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -244,11 +244,8 @@ static void __init early_cpu_detect(void)
 
 	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;
+	phys_proc_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
 #endif
 }
 
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index b9fd0252c27..99f038ede23 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -719,7 +719,6 @@ static void __init display_cacheinfo(struct cpuinfo_x86 *c)
 	}
 }
 
-#ifdef CONFIG_SMP
 /*
  * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
  * Assumes number of cores is a power of two.
@@ -729,16 +728,24 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
 #ifdef CONFIG_SMP
 	int cpu = smp_processor_id();
 	int node = 0;
+	unsigned bits;
 	if (c->x86_num_cores == 1)
 		return;
-	/* Fix up the APIC ID following the AMD specification. */
- 	cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
+
+	bits = 0;
+	while ((1 << bits) < c->x86_num_cores)
+		bits++;
+
+	/* Low order bits define the core id (index of core in socket) */
+	cpu_core_id[cpu] = phys_proc_id[cpu] & ((1 << bits)-1);
+	/* Convert the APIC ID into the socket ID */
+	phys_proc_id[cpu] >>= bits;
 
 #ifdef CONFIG_NUMA
 	/* When an ACPI SRAT table is available use the mappings from SRAT
  	   instead. */
 	if (acpi_numa <= 0) {
-		node = cpu_core_id[cpu];
+		node = phys_proc_id[cpu];
 		if (!node_online(node))
 			node = first_node(node_online_map);
 		cpu_to_node[cpu] = node;
@@ -746,18 +753,11 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
 		node = cpu_to_node[cpu];
 	}
 #endif
-	/* For now: - better than BAD_APIC_ID at least*/
-	phys_proc_id[cpu] = cpu_core_id[cpu];
 
 	printk(KERN_INFO "CPU %d(%d) -> Node %d -> Core %d\n",
 			cpu, c->x86_num_cores, node, cpu_core_id[cpu]);
 #endif
 }
-#else
-static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
-{
-}
-#endif
 
 static int __init init_amd(struct cpuinfo_x86 *c)
 {
@@ -963,8 +963,7 @@ void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	}
 
 #ifdef CONFIG_SMP
-	phys_proc_id[smp_processor_id()] =
-	cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
+	phys_proc_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
 #endif
 }