[PATCH 11/11] io_uring: merge conditional unlock flush helpers

[Pavel Begunkov <asml.silence@gmail.com>]

There is no reason not to use __io_cq_unlock_post_flush for intermediate
aux CQE flushing, all ->task_complete should apply there, i.e. if set it
should be the submitter task. Combine them, get rid of of
__io_cq_unlock_post() and rename the left function.

This place was also taking a couple percents of CPU according to
profiles for max throughput net benchmarks due to multishot recv
flooding it with completions.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/io_uring.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 70fffed83e95..1b53a2ab0a27 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -637,18 +637,7 @@ static inline void io_cq_lock(struct io_ring_ctx *ctx)
 	spin_lock(&ctx->completion_lock);
 }
 
-/* keep it inlined for io_submit_flush_completions() */
 static inline void __io_cq_unlock_post(struct io_ring_ctx *ctx)
-{
-	io_commit_cqring(ctx);
-	if (!ctx->task_complete)
-		spin_unlock(&ctx->completion_lock);
-
-	io_commit_cqring_flush(ctx);
-	io_cqring_wake(ctx);
-}
-
-static void __io_cq_unlock_post_flush(struct io_ring_ctx *ctx)
 {
 	io_commit_cqring(ctx);
 
@@ -1568,7 +1557,7 @@ static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
 			}
 		}
 	}
-	__io_cq_unlock_post_flush(ctx);
+	__io_cq_unlock_post(ctx);
 
 	if (!wq_list_empty(&ctx->submit_state.compl_reqs)) {
 		io_free_batch_list(ctx, state->compl_reqs.first);
-- 
2.40.0