Re: [PATCH 1/2] signals: collect_signal: remove the unneeded sigismember() check

From: Roland McGrath
Date: Tue May 20 2008 - 20:57:43 EST

> collect_signal() checks sigismember(&list->signal, sig), this is not needed.
> This "sig" was just found by next_signal(), so it must be valid.

Acked-by: Roland McGrath <roland@xxxxxxxxxx>

> We have a (completely broken) call to ->notifier in between, but it must not
> play with sigpending->signal bits or unlock ->siglock.

The only use of ->notifier/notifier_mask is for block_all_signals.
Its only user in the tree is drm_lock(), but it is exported too.

drm_lock is using block_all_signals to catch all the stop signals
for a purpose that is not immediately clear to me.

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