pidfd: change do_notify_pidfd() to use __wake_up(poll_to_key(EPOLLIN))

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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>

...

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Oleg Nesterov 2024-02-05 15:13:48 +01:00 • committed by Christian Brauner

parent a1c6d5439f

commit 9ed52108f6

1 changed files with 4 additions and 3 deletions

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kernel/signal.c

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