perf metric: Add expr__add_id function

[linux-2.6-microblaze.git] / fs / io_uring.c

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e507737..d37d7ea 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4072,6 +4072,29 @@ struct io_poll_table {
        int error;
 };
 
+static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb)
+{
+       struct task_struct *tsk = req->task;
+       struct io_ring_ctx *ctx = req->ctx;
+       int ret, notify = TWA_RESUME;
+
+       /*
+        * SQPOLL kernel thread doesn't need notification, just a wakeup.
+        * If we're not using an eventfd, then TWA_RESUME is always fine,
+        * as we won't have dependencies between request completions for
+        * other kernel wait conditions.
+        */
+       if (ctx->flags & IORING_SETUP_SQPOLL)
+               notify = 0;
+       else if (ctx->cq_ev_fd)
+               notify = TWA_SIGNAL;
+
+       ret = task_work_add(tsk, cb, notify);
+       if (!ret)
+               wake_up_process(tsk);
+       return ret;
+}
+
 static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
                           __poll_t mask, task_work_func_t func)
 {
@@ -4095,13 +4118,13 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
         * of executing it. We can't safely execute it anyway, as we may not
         * have the needed state needed for it anyway.
         */
-       ret = task_work_add(tsk, &req->task_work, true);
+       ret = io_req_task_work_add(req, &req->task_work);
        if (unlikely(ret)) {
                WRITE_ONCE(poll->canceled, true);
                tsk = io_wq_get_task(req->ctx->io_wq);
-               task_work_add(tsk, &req->task_work, true);
+               task_work_add(tsk, &req->task_work, 0);
+               wake_up_process(tsk);
        }
-       wake_up_process(tsk);
        return 1;
 }
 
@@ -6182,15 +6205,23 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
        do {
                prepare_to_wait_exclusive(&ctx->wait, &iowq.wq,
                                                TASK_INTERRUPTIBLE);
+               /* make sure we run task_work before checking for signals */
                if (current->task_works)
                        task_work_run();
-               if (io_should_wake(&iowq, false))
-                       break;
-               schedule();
                if (signal_pending(current)) {
+                       if (current->jobctl & JOBCTL_TASK_WORK) {
+                               spin_lock_irq(&current->sighand->siglock);
+                               current->jobctl &= ~JOBCTL_TASK_WORK;
+                               recalc_sigpending();
+                               spin_unlock_irq(&current->sighand->siglock);
+                               continue;
+                       }
                        ret = -EINTR;
                        break;
                }
+               if (io_should_wake(&iowq, false))
+                       break;
+               schedule();
        } while (1);
        finish_wait(&ctx->wait, &iowq.wq);