[PATCH] [1/1] slab: fix crash on __drain_alien_cahce() during CPU Hotplug

["shin, jacob" <jacob.shin@amd.com>]

transfer_objects should only be called when all of the cpus in the
node are online.  CPU_DEAD notifier callback marks l3->shared to NULL.

Signed-off-by: Jacob Shin <jacob.shin@amd.com>

---
 mm/slab.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux.orig/mm/slab.c	2006-04-26 21:19:25.000000000 -0500
+++ linux/mm/slab.c	2006-04-28 09:45:53.000000000 -0500
@@ -979,7 +979,8 @@ static void __drain_alien_cache(struct k
 		 * That way we could avoid the overhead of putting the objects
 		 * into the free lists and getting them back later.
 		 */
-		transfer_objects(rl3->shared, ac, ac->limit);
+		if (rl3->shared)
+			transfer_objects(rl3->shared, ac, ac->limit);
 
 		free_block(cachep, ac->entry, ac->avail, node);
 		ac->avail = 0;

-
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