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authorNeilBrown <neilb@suse.de>2006-12-08 02:36:17 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 08:28:39 -0800
commitd63a5a74dee87883fda6b7d170244acaac5b05e8 (patch)
tree8b12bc626b8f1507b7b550865c5f8282bcac6c27 /include/linux/mutex.h
parent6796bf54a64df36f96a42ae222423fffe36c58a5 (diff)
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[PATCH] lockdep: avoid lockdep warning in md
md_open takes ->reconfig_mutex which causes lockdep to complain. This (normally) doesn't have deadlock potential as the possible conflict is with a reconfig_mutex in a different device. I say "normally" because if a loop were created in the array->member hierarchy a deadlock could happen. However that causes bigger problems than a deadlock and should be fixed independently. So we flag the lock in md_open as a nested lock. This requires defining mutex_lock_interruptible_nested. Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/mutex.h')
-rw-r--r--include/linux/mutex.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index b2b91c477563..a7544afd7582 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -125,8 +125,10 @@ extern int fastcall mutex_lock_interruptible(struct mutex *lock);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern void mutex_lock_nested(struct mutex *lock, unsigned int subclass);
+extern int mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass);
#else
# define mutex_lock_nested(lock, subclass) mutex_lock(lock)
+# define mutex_lock_interruptible_nested(lock, subclass) mutex_lock_interruptible(lock)
#endif
/*