Commit 693f7d36 authored by shin, jacob's avatar shin, jacob Committed by Linus Torvalds
Browse files

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

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: default avatarJacob Shin <>
Signed-off-by: default avatarLinus Torvalds <>
parent 4de0b1ee
......@@ -979,7 +979,8 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
* 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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