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From: Arnd Bergmann <arnd@arndb.de>
To: Paul Mundt <lethal@linux-sh.org>
Subject: Re: [PATCH 6/9] gpiolib: use descriptors internally
Date: Tue, 12 Feb 2013 17:18:48 +0000
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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