[PATCH 3/4] io_uring: optimise commit_sqring() for common case

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

It should be pretty rare to not submitting anything when there is
something in the ring. No need to keep heuristics for this case.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 05d07974a5b3..642aca3f2d1f 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4506,14 +4506,12 @@ static void io_commit_sqring(struct io_ring_ctx *ctx)
 {
 	struct io_rings *rings = ctx->rings;
 
-	if (ctx->cached_sq_head != READ_ONCE(rings->sq.head)) {
-		/*
-		 * Ensure any loads from the SQEs are done at this point,
-		 * since once we write the new head, the application could
-		 * write new data to them.
-		 */
-		smp_store_release(&rings->sq.head, ctx->cached_sq_head);
-	}
+	/*
+	 * Ensure any loads from the SQEs are done at this point,
+	 * since once we write the new head, the application could
+	 * write new data to them.
+	 */
+	smp_store_release(&rings->sq.head, ctx->cached_sq_head);
 }
 
 /*
-- 
2.24.0