locking/mutex: Explicitly mark task as running after wakeup
By the time we wake up and get the lock after being asleep
in the slowpath, we better be running. As good practice,
be explicit about this and avoid any mischief.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1421717961.4903.11.camel@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index c67a60b..5740706 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -587,6 +587,8 @@
schedule_preempt_disabled();
spin_lock_mutex(&lock->wait_lock, flags);
}
+ __set_task_state(task, TASK_RUNNING);
+
mutex_remove_waiter(lock, &waiter, current_thread_info());
/* set it to 0 if there are no waiters left: */
if (likely(list_empty(&lock->wait_list)))
