diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index ad0e3335c48151d023435c72718db204c31cb481..93bec48f09ed78b11322fe124fdbda09b1c46b49 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -684,9 +684,16 @@ __mutex_unlock_common_slowpath(struct mutex *lock, int nested) unsigned long flags; /* - * some architectures leave the lock unlocked in the fastpath failure + * As a performance measurement, release the lock before doing other + * wakeup related duties to follow. This allows other tasks to acquire + * the lock sooner, while still handling cleanups in past unlock calls. + * This can be done as we do not enforce strict equivalence between the + * mutex counter and wait_list. + * + * + * Some architectures leave the lock unlocked in the fastpath failure * case, others need to leave it locked. In the later case we have to - * unlock it here + * unlock it here - as the lock counter is currently 0 or negative. */ if (__mutex_slowpath_needs_to_unlock()) atomic_set(&lock->count, 1);