Lockdep treats down_write_trylock like regular down_write
This causes constructions like down_write(&mm1->mmap_sem); if (down_write_trylock(&mm2->mmap_sem)) { ... up_write(&mm2->mmap_sem); } up_write(&mm1->mmap_sem); generate a lockdep warning about circular locking dependence. Call rwsem_acquire() with trylock set to 1. Cc: Ingo Molnar <mingo@elte.hu> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -60,7 +60,7 @@ int down_write_trylock(struct rw_semaphore *sem)
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int ret = __down_write_trylock(sem);
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if (ret == 1)
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rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);
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rwsem_acquire(&sem->dep_map, 0, 1, _RET_IP_);
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return ret;
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}
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