futex,rt_mutex: Introduce rt_mutex_init_waiter()

Since there's already two copies of this code, introduce a helper now
before adding a third one.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: juri.lelli@arm.com
Cc: bigeasy@linutronix.de
Cc: xlpang@redhat.com
Cc: rostedt@goodmis.org
Cc: mathieu.desnoyers@efficios.com
Cc: jdesfossez@efficios.com
Cc: dvhart@infradead.org
Cc: bristot@redhat.com
Link: http://lkml.kernel.org/r/20170322104151.950039479@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 4 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index 3b0aace334a8..f03ff63326d7 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2956,10 +2956,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
          * The waiter is allocated on our stack, manipulated by the requeue
          * code while we sleep on uaddr.
          */
-        debug_rt_mutex_init_waiter(&rt_waiter);
-        RB_CLEAR_NODE(&rt_waiter.pi_tree_entry);
-        RB_CLEAR_NODE(&rt_waiter.tree_entry);
-        rt_waiter.task = NULL;
+        rt_mutex_init_waiter(&rt_waiter);
 
         ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE);
         if (unlikely(ret != 0))