[PATCHSET v2 0/7] Allow signals for IO threads

[Jens Axboe <axboe@kernel.dk>]

Hi,

For the v1 posting, see here:

https://lore.kernel.org/io-uring/20210326003928.978750-1-axboe@kernel.dk/

I've run this through the usual testing, and it's running long term right
now. I've tested the cases that Stefan reported, and we seem fine now.

Changes since v1:

- Catch fatal signals in get_signal() for PF_IO_WORKER. This is only a
  problem for nested signals, like SIGSTOP followed by SIGKILL. We
  can't have get_signal() calling do_exit() on behalf of the IO threads,
  they have cleanups to do. Thanks Stefan.

- Move signal masking to when the PF_IO_WORKER thread is created, and since
  we now handle SIGSTOP, unmask that as well. Thanks Oleg.

- Remove try_to_freeze() parts in IO threads, we don't need those anymore
  with the calling of get_signal().

- Minor cleanups.

 fs/io-wq.c       | 24 +++++++++++++++++-------
 fs/io_uring.c    | 12 ++++++++----
 kernel/fork.c    | 16 ++++++++--------
 kernel/freezer.c |  2 +-
 kernel/ptrace.c  |  2 +-
 kernel/signal.c  | 19 ++++++++++++-------
 6 files changed, 47 insertions(+), 28 deletions(-)

-- 
Jens Axboe