futex,rt_mutex: Introduce rt_mutex_init_waiter()
[ Upstream commit 50809358 ] 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> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Acked-by: Joe Korty <joe.korty@concurrent-rt.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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