io_uring: optimise commit_sqring() for common case

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>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -4501,14 +4501,12 @@ 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);
-	}
 }
 
 /*