From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Thu, 25 Jun 2009 19:31:37 +0000 (-0700)
Subject: fix RCU-callback-after-kmem_cache_destroy problem in sl[aou]b
X-Git-Tag: v2.6.27.29~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6e23180eed05084ec631b2d2de0e94df8b48c74;p=pandora-kernel.git

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>
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