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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-06-25 12:31:37 -0700
committerPekka Enberg <penberg@cs.helsinki.fi>2009-06-26 12:10:47 +0300
commit7ed9f7e5db58c6e8c2b4b738a75d5dcd8e17aad5 (patch)
treec8ee9b63e1e8d3925b8a08a2b21a331434d183b5 /mm/slab.c
parent28d0325ce6e0a52f53d8af687e6427fee59004d3 (diff)
downloadop-kernel-dev-7ed9f7e5db58c6e8c2b4b738a75d5dcd8e17aad5.zip
op-kernel-dev-7ed9f7e5db58c6e8c2b4b738a75d5dcd8e17aad5.tar.gz
fix RCU-callback-after-kmem_cache_destroy problem in sl[aou]b
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. Cc: <stable@kernel.org> 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>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c
index e74a16e..5241b65 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2547,7 +2547,7 @@ void kmem_cache_destroy(struct kmem_cache *cachep)
}
if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU))
- synchronize_rcu();
+ rcu_barrier();
__kmem_cache_destroy(cachep);
mutex_unlock(&cache_chain_mutex);
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