Commit 49f384b8 authored by Siddha, Suresh B's avatar Siddha, Suresh B Committed by Linus Torvalds
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[PATCH] x86: fix smp_num_siblings on buggy BIOSes

This fixes 'smp_num_siblings' value on the systems with a buggy bios,
which sets number of siblings to '2' even when HT is disabled.  (more
details are at


I am planning to do more cleanup in this area (like moving smp_num_siblings
to per cpuinfo) shortly.
Signed-off-by: default avatarSuresh Siddha <>
Signed-off-by: default avatarVenkatesh Pallipadi <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent b60c1f6f
......@@ -1074,8 +1074,10 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
cpu_set(cpu, cpu_sibling_map[cpu]);
if (siblings != smp_num_siblings)
if (siblings != smp_num_siblings) {
printk(KERN_WARNING "WARNING: %d siblings found for CPU%d, should be %d\n", siblings, cpu, smp_num_siblings);
smp_num_siblings = siblings;
if (c->x86_num_cores > 1) {
for (i = 0; i < NR_CPUS; i++) {
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