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-rw-r--r--include/linux/reservation.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index d9706a6f5ae2..2b5a4679daea 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -145,6 +145,40 @@ reservation_object_get_list(struct reservation_object *obj)
}
/**
+ * reservation_object_lock - lock the reservation object
+ * @obj: the reservation object
+ * @ctx: the locking context
+ *
+ * Locks the reservation object for exclusive access and modification. Note,
+ * that the lock is only against other writers, readers will run concurrently
+ * with a writer under RCU. The seqlock is used to notify readers if they
+ * overlap with a writer.
+ *
+ * As the reservation object may be locked by multiple parties in an
+ * undefined order, a #ww_acquire_ctx is passed to unwind if a cycle
+ * is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation
+ * object may be locked by itself by passing NULL as @ctx.
+ */
+static inline int
+reservation_object_lock(struct reservation_object *obj,
+ struct ww_acquire_ctx *ctx)
+{
+ return ww_mutex_lock(&obj->lock, ctx);
+}
+
+/**
+ * reservation_object_unlock - unlock the reservation object
+ * @obj: the reservation object
+ *
+ * Unlocks the reservation object following exclusive access.
+ */
+static inline void
+reservation_object_unlock(struct reservation_object *obj)
+{
+ ww_mutex_unlock(&obj->lock);
+}
+
+/**
* reservation_object_get_excl - get the reservation object's
* exclusive fence, with update-side lock held
* @obj: the reservation object
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