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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2009-06-25 12:31:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-07-30 16:05:58 -0700 |
| commit | c6e23180eed05084ec631b2d2de0e94df8b48c74 (patch) | |
| tree | e3e4ecaad1ca3be4c035ee32ffcc8677fc85f7dd /mm/slob.c | |
| parent | 940a9e0f721c8498ebc23888171dac7046660278 (diff) | |
| download | lwn-c6e23180eed05084ec631b2d2de0e94df8b48c74.tar.gz lwn-c6e23180eed05084ec631b2d2de0e94df8b48c74.zip | |
fix RCU-callback-after-kmem_cache_destroy problem in sl[aou]b
commit 7ed9f7e5db58c6e8c2b4b738a75d5dcd8e17aad5 upstream.
Jesper noted that kmem_cache_destroy() invokes synchronize_rcu() rather than
rcu_barrier() in the SLAB_DESTROY_BY_RCU case, which could result in RCU
callbacks accessing a kmem_cache after it had been destroyed.
Acked-by: Matt Mackall <mpm@selenic.com>
Reported-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm/slob.c')
| -rw-r--r-- | mm/slob.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/slob.c b/mm/slob.c index cb675d126791..ed04252cba58 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -561,6 +561,8 @@ EXPORT_SYMBOL(kmem_cache_create); void kmem_cache_destroy(struct kmem_cache *c) { + if (c->flags & SLAB_DESTROY_BY_RCU) + rcu_barrier(); slob_free(c, sizeof(struct kmem_cache)); } EXPORT_SYMBOL(kmem_cache_destroy); |