[PATCH] x86_64: Fix numa node topology detection for srat based x86_64 boxes

2.6.14-rc2 does not assign cpus to proper nodeids on our em64t numa boxen.
Our boxes use acpi srat for parsing the numa information.

srat_detect_node() used phys_proc_id[] to get to the cpu's local apic id,
but phys_proc_id[] represents the cpu<->initial_apic_id mapping.  The
following patch fixes this problem.  Now apicid_to_node[] is properly
indexed with the local apic id.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 257f5ba17902..cb28df14ff6f 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -967,13 +967,12 @@ static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
 static void srat_detect_node(void)
 {
 #ifdef CONFIG_NUMA
-        unsigned apicid, node;
+        unsigned node;
         int cpu = smp_processor_id();
 
         /* Don't do the funky fallback heuristics the AMD version employs
            for now. */
-        apicid = phys_proc_id[cpu];
-        node = apicid_to_node[apicid];
+        node = apicid_to_node[hard_smp_processor_id()];
         if (node == NUMA_NO_NODE)
                 node = 0;
         cpu_to_node[cpu] = node;