[PATCH] do not free non slab allocated per_cpu_pageset

Stops panic associated with attempting to free a non slab-allocated
per_cpu_pageset.

Signed-off-by: David Rientjes <rientjes@cs.washington.edu>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: <stable@kernel.org>
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/mm/page_alloc.c b/mm/page_alloc.c
index 3b5358a0561f..8a52ba9fe693 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1845,8 +1845,10 @@ static inline void free_zone_pagesets(int cpu)
         for_each_zone(zone) {
                 struct per_cpu_pageset *pset = zone_pcp(zone, cpu);
 
+                /* Free per_cpu_pageset if it is slab allocated */
+                if (pset != &boot_pageset[cpu])
+                        kfree(pset);
                 zone_pcp(zone, cpu) = NULL;
-                kfree(pset);
         }
 }