linux-kernel - [PATCH 0/1] sched/wait: wait_event*_timeout() needs ___wait_cond

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Message-ID: <20131007183043.GA10969@redhat.com>
Date:	Mon, 7 Oct 2013 20:30:43 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] sched/wait: wait_event*_timeout() needs
	___wait_cond_timeout() too

And another patch we already discussed.

wait_event_timeout(wq, true, 0) still returns 0, this doesn't look
right, and this doesn't match __wait_event_timeout(timeout => 0).

Sure, most probably nobody uses the constant timeout == 0, but this
can break the code which does something like

	if (nonblock)
		timeout = 0;
	else
		timeout = TIMEOUT;

	success = wait_event_timeout(wq, CONDITION, timeout);

Oleg.

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