[PATCH 0/1] exit: change the release_task() paths to call flush_sigqueue() lockless

[Oleg Nesterov]

Thomas, Frederic, could you review?

Untested, and I'll recheck this patch tomorrow, perhaps I missed something...

Mateusz, this patch has minor conflicts with your

	[PATCH v3 0/6] reduce tasklist_lock hold time on exit and do some

WIP changes. I can wait for v4 from you and rebase on top, but I'd like
to show this patch right now to simplify the review.

Oleg.