fio_sem: Remove a read_barrier() call

Since pthread_mutex_lock() already provides load-acquire semantics, calling
read_barrier() just after pthread_mutex_lock() is not necessary. See also
commit 4d4e80f2b426 ("Revamp file locking").

Signed-off-by: Bart Van Assche <bvanassche@acm.org>

diff --git a/fio_sem.c b/fio_sem.c
index c34d8bf76565ab7f93be9b9d2f6bbf41808f3950..c7806acb26ae3ea51211e5488819ce24add451db 100644 (file)
--- a/fio_sem.c
+++ b/fio_sem.c
@@ -169,7 +169,6 @@ void fio_sem_up(struct fio_sem *sem)
        assert(sem->magic == FIO_SEM_MAGIC);
 
        pthread_mutex_lock(&sem->lock);
-       read_barrier();
        if (!sem->value && sem->waiters)
                do_wake = 1;
        sem->value++;