[PATCH] x86: Allow percpu variables to be page-aligned

Let's allow page-alignment in general for per-cpu data (wanted by Xen, and
Ingo suggested KVM as well).

Because larger alignments can use more room, we increase the max per-cpu
memory to 64k rather than 32k: it's getting a little tight.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index d4f0a70f4845..1fac215252e4 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1343,11 +1343,11 @@ void __init setup_per_cpu_areas(void)
         /* Copy section for each CPU (we discard the original) */
         goal = PERCPU_ENOUGH_ROOM;
 
-        __per_cpu_shift = 0;
-        for (size = 1UL; size < goal; size <<= 1UL)
+        __per_cpu_shift = PAGE_SHIFT;
+        for (size = PAGE_SIZE; size < goal; size <<= 1UL)
                 __per_cpu_shift++;
 
-        ptr = alloc_bootmem(size * NR_CPUS);
+        ptr = alloc_bootmem_pages(size * NR_CPUS);
 
         __per_cpu_base = ptr - __per_cpu_start;