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, 2 insertions, 2 deletions

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 539d42530fc4..4fa33c27ccb6 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -147,7 +147,7 @@ void __init xen_smp_prepare_boot_cpu(void)
         make_lowmem_page_readwrite(&per_cpu__gdt_page);
 
         for (cpu = 0; cpu < NR_CPUS; cpu++) {
-                cpus_clear(cpu_sibling_map[cpu]);
+                cpus_clear(per_cpu(cpu_sibling_map, cpu));
                 /*
                  * cpu_core_map lives in a per cpu area that is cleared
                  * when the per cpu array is allocated.
@@ -164,7 +164,7 @@ void __init xen_smp_prepare_cpus(unsigned int max_cpus)
         unsigned cpu;
 
         for (cpu = 0; cpu < NR_CPUS; cpu++) {
-                cpus_clear(cpu_sibling_map[cpu]);
+                cpus_clear(per_cpu(cpu_sibling_map, cpu));
                 /*
                  * cpu_core_ map will be zeroed when the per
                  * cpu area is allocated.