diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 148983e21d47..bb76e82398b2 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -50,7 +50,7 @@ struct rw_semaphore {
 };
 
 /*
- * Setting bit 1 of the owner field but not bit 0 will indicate
+ * Setting all bits of the owner field except bit 0 will indicate
  * that the rwsem is writer-owned with an unknown owner.
  */
 #define RWSEM_OWNER_UNKNOWN	((struct task_struct *)-2L)
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
index ded96023f4dc..180455b6b0d4 100644
--- a/kernel/locking/rwsem.c
+++ b/kernel/locking/rwsem.c
@@ -33,17 +33,18 @@
 /*
  * The least significant 2 bits of the owner value has the following
  * meanings when set.
- *  - RWSEM_READER_OWNED (bit 0): The rwsem is owned by readers
- *  - RWSEM_ANONYMOUSLY_OWNED (bit 1): The rwsem is anonymously owned,
- *    i.e. the owner(s) cannot be readily determined. It can be reader
- *    owned or the owning writer is indeterminate.
+ *  - Bit 0: RWSEM_READER_OWNED - The rwsem is owned by readers
+ *  - Bit 1: RWSEM_NONSPINNABLE - Waiters cannot spin on the rwsem
+ *    The rwsem is anonymously owned, i.e. the owner(s) cannot be
+ *    readily determined. It can be reader owned or the owning writer
+ *    is indeterminate.
  *
  * When a writer acquires a rwsem, it puts its task_struct pointer
  * into the owner field. It is cleared after an unlock.
  *
  * When a reader acquires a rwsem, it will also puts its task_struct
  * pointer into the owner field with both the RWSEM_READER_OWNED and
- * RWSEM_ANONYMOUSLY_OWNED bits set. On unlock, the owner field will
+ * RWSEM_NONSPINNABLE bits set. On unlock, the owner field will
  * largely be left untouched. So for a free or reader-owned rwsem,
  * the owner value may contain information about the last reader that
  * acquires the rwsem. The anonymous bit is set because that particular
@@ -55,7 +56,8 @@
  * a rwsem, but the overhead is simply too big.
  */
 #define RWSEM_READER_OWNED	(1UL << 0)
-#define RWSEM_ANONYMOUSLY_OWNED	(1UL << 1)
+#define RWSEM_NONSPINNABLE	(1UL << 1)
+#define RWSEM_OWNER_FLAGS_MASK	(RWSEM_READER_OWNED | RWSEM_NONSPINNABLE)
 
 #ifdef CONFIG_DEBUG_RWSEMS
 # define DEBUG_RWSEMS_WARN_ON(c, sem)	do {			\
@@ -132,7 +134,7 @@ static inline void __rwsem_set_reader_owned(struct rw_semaphore *sem,
 					    struct task_struct *owner)
 {
 	unsigned long val = (unsigned long)owner | RWSEM_READER_OWNED
-						 | RWSEM_ANONYMOUSLY_OWNED;
+						 | RWSEM_NONSPINNABLE;
 
 	WRITE_ONCE(sem->owner, (struct task_struct *)val);
 }
@@ -144,20 +146,12 @@ static inline void rwsem_set_reader_owned(struct rw_semaphore *sem)
 
 /*
  * Return true if the a rwsem waiter can spin on the rwsem's owner
- * and steal the lock, i.e. the lock is not anonymously owned.
+ * and steal the lock.
  * N.B. !owner is considered spinnable.
  */
 static inline bool is_rwsem_owner_spinnable(struct task_struct *owner)
 {
-	return !((unsigned long)owner & RWSEM_ANONYMOUSLY_OWNED);
-}
-
-/*
- * Return true if rwsem is owned by an anonymous writer or readers.
- */
-static inline bool rwsem_has_anonymous_owner(struct task_struct *owner)
-{
-	return (unsigned long)owner & RWSEM_ANONYMOUSLY_OWNED;
+	return !((unsigned long)owner & RWSEM_NONSPINNABLE);
 }
 
 #ifdef CONFIG_DEBUG_RWSEMS
@@ -170,10 +164,10 @@ static inline bool rwsem_has_anonymous_owner(struct task_struct *owner)
 static inline void rwsem_clear_reader_owned(struct rw_semaphore *sem)
 {
 	unsigned long val = (unsigned long)current | RWSEM_READER_OWNED
-						   | RWSEM_ANONYMOUSLY_OWNED;
+						   | RWSEM_NONSPINNABLE;
 	if (READ_ONCE(sem->owner) == (struct task_struct *)val)
 		cmpxchg_relaxed((unsigned long *)&sem->owner, val,
-				RWSEM_READER_OWNED | RWSEM_ANONYMOUSLY_OWNED);
+				RWSEM_READER_OWNED | RWSEM_NONSPINNABLE);
 }
 #else
 static inline void rwsem_clear_reader_owned(struct rw_semaphore *sem)
@@ -495,7 +489,7 @@ static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem)
 	struct task_struct *owner;
 	bool ret = true;
 
-	BUILD_BUG_ON(!rwsem_has_anonymous_owner(RWSEM_OWNER_UNKNOWN));
+	BUILD_BUG_ON(is_rwsem_owner_spinnable(RWSEM_OWNER_UNKNOWN));
 
 	if (need_resched())
 		return false;
@@ -534,7 +528,7 @@ static inline enum owner_state rwsem_owner_state(unsigned long owner)
 	if (!owner)
 		return OWNER_NULL;
 
-	if (owner & RWSEM_ANONYMOUSLY_OWNED)
+	if (owner & RWSEM_NONSPINNABLE)
 		return OWNER_NONSPINNABLE;
 
 	if (owner & RWSEM_READER_OWNED)
@@ -1043,7 +1037,12 @@ static inline void __up_write(struct rw_semaphore *sem)
 {
 	long tmp;
 
-	DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
+	/*
+	 * sem->owner may differ from current if the ownership is transferred
+	 * to an anonymous writer by setting the RWSEM_NONSPINNABLE bits.
+	 */
+	DEBUG_RWSEMS_WARN_ON((sem->owner != current) &&
+			    !((long)sem->owner & RWSEM_NONSPINNABLE), sem);
 	rwsem_clear_owner(sem);
 	tmp = atomic_long_fetch_add_release(-RWSEM_WRITER_LOCKED, &sem->count);
 	if (unlikely(tmp & RWSEM_FLAG_WAITERS))