Re: [PATCH/RFC] signal races/bugs, losing TIF_SIGPENDING and otherwoes

[Benjamin Herrenschmidt]

On Tue, 2007-06-05 at 08:52 -0700, Davide Libenzi wrote:
>         if (tsk == current)
>                 recalc_sigpending();
> 
> What can happen, is that a task may notice TIF_SIGPENDING and not find
> a 
> signal once it calls dequeue_signal(), but this is fine as far as
> signalfd 
> goes. This should be OK in general, no? 

What about the code in __dequeue_signal though ? That notifier thing is
used by the DRI though I'm not sure what would happen if it acts on the
wrong task.

Ben.

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