[PATCH 6/9] gpiolib: use descriptors internally

[Arnd Bergmann]

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