[PATCH] lockdep: annotate af_unix locking

Teach special (recursive) locking code to the lock validator.  Also splits
af_unix's sk_receive_queue.lock class from the other networking skb-queue
locks.  Has no effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 5ba72d95280c..2fec827c8801 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -67,6 +67,9 @@ struct unix_skb_parms {
 #define unix_state_rlock(s)     spin_lock(&unix_sk(s)->lock)
 #define unix_state_runlock(s)   spin_unlock(&unix_sk(s)->lock)
 #define unix_state_wlock(s)     spin_lock(&unix_sk(s)->lock)
+#define unix_state_wlock_nested(s) \
+                                spin_lock_nested(&unix_sk(s)->lock, \
+                                SINGLE_DEPTH_NESTING)
 #define unix_state_wunlock(s)   spin_unlock(&unix_sk(s)->lock)
 
 #ifdef __KERNEL__