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locking/rtmutex: Don't initialize lockdep when not required 

pi_mutex isn't supposed to be tracked by lockdep, but just
passing NULLs for name and key will cause lockdep to spew a
warning and die, which is not what we want it to do.

Skip lockdep initialization if the caller passed NULLs for
name and key, suggesting such initialization isn't desired.

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: f5694788ad ("rt_mutex: Add lockdep annotations")
Link: http://lkml.kernel.org/r/20170618140548.4763-1-alexander.levin@verizon.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Levin, Alexander (Sasha Levin) 2017-06-18 14:06:01 +00:00 committed by Ingo Molnar
parent 018956d641
commit cde50a6739
1 changed files with 2 additions and 1 deletions
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3
kernel/locking/rtmutex.c
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@ -1661,7 +1661,8 @@ void __rt_mutex_init(struct rt_mutex *lock, const char *name,
lock->waiters = RB_ROOT;
lock->waiters_leftmost = NULL;
debug_rt_mutex_init(lock, name, key);
if (name && key)
debug_rt_mutex_init(lock, name, key);
}
EXPORT_SYMBOL_GPL(__rt_mutex_init);