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

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
......@@ -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;
......
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