Convert cpu_sibling_map to be a per cpu variable

Convert cpu_sibling_map from a static array sized by NR_CPUS to a per_cpu
variable.  This saves sizeof(cpumask_t) * NR unused cpus.  Access is mostly
from startup and CPU HOTPLUG functions.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/block/blktrace.c b/block/blktrace.c
index 775471ef84a5..d00ac3993c18 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -550,7 +550,7 @@ static void blk_trace_set_ht_offsets(void)
         for_each_online_cpu(cpu) {
                 unsigned long long *cpu_off, *sibling_off;
 
-                for_each_cpu_mask(i, cpu_sibling_map[cpu]) {
+                for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) {
                         if (i == cpu)
                                 continue;