linux-kernel - Re: [PATCH 6/9] gpiolib: use descriptors internally

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Message-Id: <201302121718.48244.arnd@arndb.de>
Date:	Tue, 12 Feb 2013 17:18:48 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Alexandre Courbot <acourbot@...dia.com>,
	"linux-arch" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Mike Turquette <mturquette@...aro.org>
Subject: Re: [PATCH 6/9] gpiolib: use descriptors internally

On Tuesday 12 February 2013, Paul Mundt wrote:
> > While I do get the point... I chatted with Grant about it and
> > I want to talk to some toolchain people about this to see if
> > pointers containing potential error codes can somehow be
> > "flagged" by the compiler so we can enforce error checking on
> > them. (It may sound a bit utopic...)
> > 
> At the very least you can __must_check annotate, although that's probably
> still a bit coarser grained than what you're after.

There is an idea: we could have variants of __must_check for different
classes of returns: NULL error, ERR_PTR, negative integer on error, ...

	Arnd
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