Commit 28c4721b authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: replace cmpxchg in fallback with xchg 



io_run_ctx_fallback() can use xchg() instead of cmpxchg(). It's simpler
and faster.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 2c32395d

fs/io_uring.c

+2 −6
Original line number Diff line number Diff line
@@ -8484,15 +8484,11 @@ static int io_remove_personalities(int id, void *p, void *data) 


static bool io_run_ctx_fallback(struct io_ring_ctx *ctx)

{

	struct callback_head *work, *head, *next;

	struct callback_head *work, *next;

	bool executed = false;



	do {

		do {

			head = NULL;

			work = READ_ONCE(ctx->exit_task_work);

		} while (cmpxchg(&ctx->exit_task_work, work, head) != work);



		work = xchg(&ctx->exit_task_work, NULL);

		if (!work)

			break;