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

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Message-Id: <20080521005646.1BD5426FA1C@magilla.localdomain>
Date:	Tue, 20 May 2008 17:56:46 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] signals: collect_signal: remove the unneeded sigismember() check

> 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@...hat.com>

> 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.  


Thanks,
Roland
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