From: Ravikiran G Thirumalai Date: Mon, 3 Oct 2005 17:36:28 +0000 (-0700) Subject: [PATCH] x86_64: Fix numa node topology detection for srat based x86_64 boxes X-Git-Tag: v2.6.14-rc4~83 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ddea7be0ec8d1374f0b483a81566ed56ec9f3905;p=linux-2.6 [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 Acked-by: Suresh Siddha Cc: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index 257f5ba179..cb28df14ff 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;