mcslock: use WFE in lock for aarch64

Instead of polling for previous lock holder unlocking, use
wait_until_equal API.

Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>

diff --git a/lib/eal/include/generic/rte_mcslock.h b/lib/eal/include/generic/rte_mcslock.h
index 9f323bd..34f33c6 100644 (file)
--- a/lib/eal/include/generic/rte_mcslock.h
+++ b/lib/eal/include/generic/rte_mcslock.h
@@ -84,8 +84,7 @@ rte_mcslock_lock(rte_mcslock_t **msl, rte_mcslock_t *me)
         * to spin on me->locked until the previous lock holder resets
         * the me->locked using mcslock_unlock().
         */
-       while (__atomic_load_n(&me->locked, __ATOMIC_ACQUIRE))
-               rte_pause();
+       rte_wait_until_equal_32((uint32_t *)&me->locked, 0, __ATOMIC_ACQUIRE);
 }
 
 /**