3 files changed, 19 insertions, 20 deletions

diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c
index fa34a06c0d79..73aeaf5a9d4e 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 11e6e6f23fa0..d199e525680a 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 b9fd0252c279..99f038ede23c 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
 }