rather than wake_up_all(). This way do_notify_pidfd() won't wakeup the
POLLHUP-only waiters which wait for pid_task() == NULL.
TODO:
- as Christian pointed out, this asks for the new wake_up_all_poll()
helper, it can already have other users.
- we can probably discriminate the PIDFD_THREAD and non-PIDFD_THREAD
waiters, but this needs more work. See
https://lore.kernel.org/all/
20240205140848.GA15853@redhat.com/
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20240205141348.GA16539@redhat.com
Reviewed-by: Tycho Andersen <tandersen@netflix.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
void do_notify_pidfd(struct task_struct *task)
{
- struct pid *pid;
+ struct pid *pid = task_pid(task);
WARN_ON(task->exit_state == 0);
- pid = task_pid(task);
- wake_up_all(&pid->wait_pidfd);
+
+ __wake_up(&pid->wait_pidfd, TASK_NORMAL, 0,
+ poll_to_key(EPOLLIN | EPOLLRDNORM));
}
/*