linux-kernel - Re: [Cbe-oss-dev] [PATCH] Updated: Reworked Cell OProfile: SPU mutex lock fix

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Message-ID: <20080510190759.GA16275@lst.de>
Date:	Sat, 10 May 2008 21:07:59 +0200
From:	Christoph Hellwig <hch@....de>
To:	Robert Richter <robert.richter@....com>
Cc:	Carl Love <cel@...ibm.com>, linuxppc-dev@...abs.org,
	oprofile-list <oprofile-list@...ts.sourceforge.net>,
	cbe-oss-dev@...abs.org, Arnd Bergmann <arnd@...db.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Cbe-oss-dev] [PATCH] Updated: Reworked Cell OProfile: SPU	mutex lock fix

> > +	/* Ignoring the return value from the unregister
> > +	 * call.  A failed return value simply says there
> > +	 * was no registered event.  Hence there will not
> > +	 * be any calls to process a switch event that
> > +	 * could cause a problem.
> > +	 */
> > +	spu_switch_event_unregister(&spu_active);
> 
> Better to use this here, to show the return value is ignored:
> 
>        (void)spu_switch_event_unregister(...)

Actually Linux style is to not add those casts.  But I don't think we
all the notifier_chain_unregister funtion should return error at all,
we should probably fix that up in the core code.
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