summaryrefslogtreecommitdiff
path: root/kernel/locking/qspinlock.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/locking/qspinlock.c')
-rw-r--r--kernel/locking/qspinlock.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c
index 47cb99787e4d..341ca666bc60 100644
--- a/kernel/locking/qspinlock.c
+++ b/kernel/locking/qspinlock.c
@@ -232,6 +232,20 @@ static __always_inline u32 xchg_tail(struct qspinlock *lock, u32 tail)
#endif /* _Q_PENDING_BITS == 8 */
/**
+ * queued_fetch_set_pending_acquire - fetch the whole lock value and set pending
+ * @lock : Pointer to queued spinlock structure
+ * Return: The previous lock value
+ *
+ * *,*,* -> *,1,*
+ */
+#ifndef queued_fetch_set_pending_acquire
+static __always_inline u32 queued_fetch_set_pending_acquire(struct qspinlock *lock)
+{
+ return atomic_fetch_or_acquire(_Q_PENDING_VAL, &lock->val);
+}
+#endif
+
+/**
* set_locked - Set the lock bit and own the lock
* @lock: Pointer to queued spinlock structure
*
@@ -328,7 +342,7 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
*
* 0,0,* -> 0,1,* -> 0,0,1 pending, trylock
*/
- val = atomic_fetch_or_acquire(_Q_PENDING_VAL, &lock->val);
+ val = queued_fetch_set_pending_acquire(lock);
/*
* If we observe contention, there is a concurrent locker.