Merge commit '683b6c6f82a60fabf47012581c2cfbf1b037ab95' into stable/for-linus-3.15

This merge of the irq-core-for-linus branch broke the ARM build when
Xen is enabled.

Conflicts:
	drivers/xen/events/events_base.c

1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c
index faf6f5b53e77..e1191c996c59 100644
--- a/kernel/locking/mutex-debug.c
+++ b/kernel/locking/mutex-debug.c
@@ -83,6 +83,12 @@ void debug_mutex_unlock(struct mutex *lock)
 
         DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
         mutex_clear_owner(lock);
+
+        /*
+         * __mutex_slowpath_needs_to_unlock() is explicitly 0 for debug
+         * mutexes so that we can do it here after we've verified state.
+         */
+        atomic_set(&lock->count, 1);
 }
 
 void debug_mutex_init(struct mutex *lock, const char *name,