io_uring: add io_commit_cqring_flush()

Since __io_commit_cqring_flush users moved to different files, introduce
io_commit_cqring_flush() helper and encapsulate all flags testing details
inside.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0da03887435dd9869ffe46dcd3962bf104afcca3.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -529,10 +529,7 @@ void __io_commit_cqring_flush(struct io_ring_ctx *ctx)
 
 static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx)
 {
-	if (unlikely(ctx->off_timeout_used || ctx->drain_active ||
-		     ctx->has_evfd))
-		__io_commit_cqring_flush(ctx);
-
+	io_commit_cqring_flush(ctx);
 	io_cqring_wake(ctx);
 }
 

io_uring/io_uring.h

@@ -229,4 +229,10 @@ static inline void io_req_add_compl_list(struct io_kiocb *req)
 	wq_list_add_tail(&req->comp_list, &state->compl_reqs);
 }
 
+static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
+{
+	if (unlikely(ctx->off_timeout_used || ctx->drain_active || ctx->has_evfd))
+		__io_commit_cqring_flush(ctx);
+}
+
 #endif

io_uring/rw.c

@@ -1016,10 +1016,7 @@ copy_iov:
 
 static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx)
 {
-	if (unlikely(ctx->off_timeout_used || ctx->drain_active ||
-		     ctx->has_evfd))
-		__io_commit_cqring_flush(ctx);
-
+	io_commit_cqring_flush(ctx);
 	if (ctx->flags & IORING_SETUP_SQPOLL)
 		io_cqring_wake(ctx);
 }