1 files changed, 13 insertions, 9 deletions

diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c
index 786d1a57048b..e6a2d6b80cda 100644
--- a/arch/i386/kernel/cpu/amd.c
+++ b/arch/i386/kernel/cpu/amd.c
@@ -224,22 +224,26 @@ static void __init init_amd(struct cpuinfo_x86 *c)
 
 #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
-         * of two.
+         * On a AMD multi core setup the lower bits of the APIC id
+         * distingush the cores.
          */
         if (c->x86_max_cores > 1) {
                 int cpu = smp_processor_id();
-                unsigned bits = 0;
-                while ((1 << bits) < c->x86_max_cores)
-                        bits++;
-                cpu_core_id[cpu] = phys_proc_id[cpu] & ((1<<bits)-1);
-                phys_proc_id[cpu] >>= bits;
+                unsigned bits = (cpuid_ecx(0x80000008) >> 12) & 0xf;
+
+                if (bits == 0) {
+                        while ((1 << bits) < c->x86_max_cores)
+                                bits++;
+                }
+                c->cpu_core_id = c->phys_proc_id & ((1<<bits)-1);
+                c->phys_proc_id >>= bits;
                 printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
-                       cpu, c->x86_max_cores, cpu_core_id[cpu]);
+                       cpu, c->x86_max_cores, c->cpu_core_id);
         }
 #endif
 
+        if (cpuid_eax(0x80000000) >= 0x80000006)
+                num_cache_leaves = 3;
 }
 
 static unsigned int amd_size_cache(struct cpuinfo_x86 * c, unsigned int size)