[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 http://bugzilla.kernel.org/show_bug.cgi?id=4359)

I am planning to do more cleanup in this area (like moving smp_num_siblings
to per cpuinfo) shortly.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 35bfe138cb1..bc1bb6919e6 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -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++) {