linux-kernel - Re: [PATCH/RFC] wait_for_completion

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Message-ID: <20131119122322.GM3866@twins.programming.kicks-ass.net>
Date:	Tue, 19 Nov 2013 13:23:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Jonathan Corbet <corbet@....net>, Dean Nelson <dcn@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	"Dr. H. Nikolaus Schaller" <hns@...delico.com>,
	Marek Belisko <marek@...delico.com>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH/RFC] wait_for_completion_timeout() considered harmful.

On Tue, Nov 19, 2013 at 07:58:51PM +1100, NeilBrown wrote:
> 	/*
> 	 * TODO: Make sure that we wait at least required delay but why we
> 	 * have to extend it one tick more?
> 	 */
> 	schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);

What makes me sad is that clearly people knew stuff was broken but
somehow it never got properly fixed.

Yes, changing something like this is risky, but I prefer to fix the
implementation to the sane and documented behaviour and fix up whatever
fallout that generates. The end result is saner code in general and less
new bugs.

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