Re: [PATCH 2/2] posix-cpu-timers: use ->sighand instead of->signal to check the task is alive

[Peter Zijlstra]

On Wed, 2009-02-04 at 00:17 +0100, Oleg Nesterov wrote:
> Sadly, it is not trivial to audit kernel/posix-cpu-timers.c, but it really
> abuses tasklist_lock. I believe it doesn't need this lock at all, but the
> changes are not easy to test.

It uses that to hold of task reaping so ->signal doesn't go away.

If we make ->signal refcountable, and rcu freed along with the tasks I
think we can get away without tasklist_lock.

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