ipc/mqueue.c: remove duplicated code

pipelined_send() and pipelined_receive() are identical, so merge them.

[manfred@colorfullife.com: add changelog]
Link: http://lkml.kernel.org/r/20191020123305.14715-3-manfred@colorfullife.com
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: <1vier1@web.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 3d920ff..2704565 100644 (file)
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -918,17 +918,12 @@ out_name:
  * The same algorithm is used for senders.
  */
 
-/* pipelined_send() - send a message directly to the task waiting in
- * sys_mq_timedreceive() (without inserting message into a queue).
- */
-static inline void pipelined_send(struct wake_q_head *wake_q,
+static inline void __pipelined_op(struct wake_q_head *wake_q,
                                  struct mqueue_inode_info *info,
-                                 struct msg_msg *message,
-                                 struct ext_wait_queue *receiver)
+                                 struct ext_wait_queue *this)
 {
-       receiver->msg = message;
-       list_del(&receiver->list);
-       wake_q_add(wake_q, receiver->task);
+       list_del(&this->list);
+       wake_q_add(wake_q, this->task);
        /*
         * Rely on the implicit cmpxchg barrier from wake_q_add such
         * that we can ensure that updating receiver->state is the last
@@ -937,7 +932,19 @@ static inline void pipelined_send(struct wake_q_head *wake_q,
         * yet, at that point we can later have a use-after-free
         * condition and bogus wakeup.
         */
-       receiver->state = STATE_READY;
+       this->state = STATE_READY;
+}
+
+/* pipelined_send() - send a message directly to the task waiting in
+ * sys_mq_timedreceive() (without inserting message into a queue).
+ */
+static inline void pipelined_send(struct wake_q_head *wake_q,
+                                 struct mqueue_inode_info *info,
+                                 struct msg_msg *message,
+                                 struct ext_wait_queue *receiver)
+{
+       receiver->msg = message;
+       __pipelined_op(wake_q, info, receiver);
 }
 
 /* pipelined_receive() - if there is task waiting in sys_mq_timedsend()
@@ -955,9 +962,7 @@ static inline void pipelined_receive(struct wake_q_head *wake_q,
        if (msg_insert(sender->msg, info))
                return;
 
-       list_del(&sender->list);
-       wake_q_add(wake_q, sender->task);
-       sender->state = STATE_READY;
+       __pipelined_op(wake_q, info, sender);
 }
 
 static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr,