[PATCH 0/1] add pid::tasks_lock to fix send_sigio() and send_sigurg()

[Oleg Nesterov]

Not for inclusion yet, just RFC. In particular, I'd like to have
a review from sashiko, I am sure I missed something ;)

Only compile tested, the changelog is obviously incomplete,
__change_pid() should die after this change, etc.

And. I am still not sure that the new lock should be per pid, perhaps
a simple global lock which aligns with tasklist makes more sense, it
should not be contended too much.

Please comment.

Oleg.

 fs/fcntl.c          |  4 ++++
 include/linux/pid.h |  1 +
 kernel/pid.c        | 24 +++++++++++++++++++-----
 3 files changed, 24 insertions(+), 5 deletions(-)