linux-kernel - Re: [PATCH 3/3] posix timers: use SIGQUEUE

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Message-Id: <20080521022750.AD7EF26FA1C@magilla.localdomain>
Date:	Tue, 20 May 2008 19:27:50 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Austin Clements <amdragon+kernelbugzilla@....edu>,
	Ingo Molnar <mingo@...e.hu>, john stultz <johnstul@...ibm.com>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] posix timers: use SIGQUEUE_CANCELLED when the timer is destroyed

> 	q->flags |= SIGQUEUE_CANCELLED;
> 	spin_lock_irqsave(lock, flags);
> 	q->flags &= ~SIGQUEUE_PREALLOC;

Just make it:

	spin_lock_irqsave(lock, flags);
	q->flags |= SIGQUEUE_CANCELLED;
	q->flags &= ~SIGQUEUE_PREALLOC;

and we needn't wax philosophical about the meaning of locking rules.  That
patch would have my ACK, but I concur with Linus about the undesireability
of the plain = version.


Thanks,
Roland
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