linux-kernel - Re: [PATCH] remove abs64()

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Date:	Wed, 13 Apr 2011 00:16:58 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Randy Dunlap <rdunlap@...otime.net>, linux-kernel@...r.kernel.org,
	behlendorf1@...l.gov, oleg@...hat.com
Subject: Re: [PATCH] remove abs64()

On Tue, Apr 12, 2011 at 02:10:40PM -0700, Andrew Morton wrote:
> On Tue, 12 Apr 2011 14:07:26 -0700
> Randy Dunlap <rdunlap@...otime.net> wrote:
> 
> > > +	__builtin_choose_expr(						\
> > > +		__builtin_types_compatible_p(typeof(_x), long long),	\
> > > +		(unsigned long long)({ _x < 0 ? -_x : _x; }),		\
> > > +	_x)))));							\
> > > +})
> > 
> > that is better?
> 
> I think so.
> 
> It's a bit concerning that it changes the return type of abs().

I haven't read every abs() user, but, yes, sizeof(abs()) silently
changing is the issue.
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