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[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>
This commit is contained in:
Ravikiran G Thirumalai 2005-10-03 10:36:28 -07:00 committed by Linus Torvalds
parent 7d6322b465
commit ddea7be0ec
1 changed files with 2 additions and 3 deletions
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5
arch/x86_64/kernel/setup.c
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@ -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;