+#ifdef CONFIG_NUMA
+static int nearby_node(int apicid)
+{
+ int i;
+ for (i = apicid - 1; i >= 0; i--) {
+ int node = apicid_to_node[i];
+ if (node != NUMA_NO_NODE && node_online(node))
+ return node;
+ }
+ for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
+ int node = apicid_to_node[i];
+ if (node != NUMA_NO_NODE && node_online(node))
+ return node;
+ }
+ return first_node(node_online_map); /* Shouldn't happen */
+}
+#endif
+
+/*
+ * 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.
+ */
+static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
+{
+#ifdef CONFIG_SMP
+ int cpu = smp_processor_id();
+ unsigned bits;
+#ifdef CONFIG_NUMA
+ int node = 0;
+ unsigned apicid = hard_smp_processor_id();
+#endif
+
+ bits = 0;
+ while ((1 << bits) < c->x86_max_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] = phys_pkg_id(bits);
+
+#ifdef CONFIG_NUMA
+ node = phys_proc_id[cpu];
+ if (apicid_to_node[apicid] != NUMA_NO_NODE)
+ node = apicid_to_node[apicid];
+ if (!node_online(node)) {
+ /* Two possibilities here:
+ - The CPU is missing memory and no node was created.
+ In that case try picking one from a nearby CPU
+ - The APIC IDs differ from the HyperTransport node IDs
+ which the K8 northbridge parsing fills in.
+ Assume they are all increased by a constant offset,
+ but in the same order as the HT nodeids.
+ If that doesn't result in a usable node fall back to the
+ path for the previous case. */
+ int ht_nodeid = apicid - (phys_proc_id[0] << bits);
+ if (ht_nodeid >= 0 &&
+ apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
+ node = apicid_to_node[ht_nodeid];
+ /* Pick a nearby node */
+ if (!node_online(node))
+ node = nearby_node(apicid);
+ }
+ numa_set_node(cpu, node);
+
+ printk(KERN_INFO "CPU %d/%x(%d) -> Node %d -> Core %d\n",
+ cpu, apicid, c->x86_max_cores, node, cpu_core_id[cpu]);
+#endif
+#endif
+}