io_uring: remove useless ->startup completion

We always do complete(&sqd->startup) almost right after sqd->thread
creation, either in the success path or in io_sq_thread_finish(). It's
specifically created not started for us to be able to set some stuff
like sqd->thread and io_uring_alloc_task_context() before following
right after wake_up_new_task().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 56f3d8f..6349374 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -272,7 +272,6 @@ struct io_sq_data {
        pid_t                   task_tgid;
 
        unsigned long           state;
-       struct completion       startup;
        struct completion       exited;
 };
 
@@ -6656,8 +6655,6 @@ static int io_sq_thread(void *data)
                set_cpus_allowed_ptr(current, cpu_online_mask);
        current->flags |= PF_NO_SETAFFINITY;
 
-       wait_for_completion(&sqd->startup);
-
        down_read(&sqd->rw_lock);
 
        while (!test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)) {
@@ -7080,7 +7077,6 @@ static void io_sq_thread_finish(struct io_ring_ctx *ctx)
        struct io_sq_data *sqd = ctx->sq_data;
 
        if (sqd) {
-               complete(&sqd->startup);
                io_sq_thread_park(sqd);
                list_del(&ctx->sqd_list);
                io_sqd_update_thread_idle(sqd);
@@ -7144,7 +7140,6 @@ static struct io_sq_data *io_get_sq_data(struct io_uring_params *p)
        INIT_LIST_HEAD(&sqd->ctx_list);
        init_rwsem(&sqd->rw_lock);
        init_waitqueue_head(&sqd->wait);
-       init_completion(&sqd->startup);
        init_completion(&sqd->exited);
        return sqd;
 }
@@ -7856,7 +7851,6 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
                wake_up_new_task(tsk);
                if (ret)
                        goto err;
-               complete(&sqd->startup);
        } else if (p->flags & IORING_SETUP_SQ_AFF) {
                /* Can't have SQ_AFF without SQPOLL */
                ret = -EINVAL;