linux-kernel - Re: [PATCH 1/1 net-next] af_unix: remove NULL assignment on static

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Message-ID: <1412715283.11600.11.camel@localhost>
Date:	Tue, 07 Oct 2014 22:54:43 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Fabian Frederick <fabf@...net.be>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1 net-next] af_unix: remove NULL assignment on static

On Di, 2014-10-07 at 22:49 +0200, Fabian Frederick wrote:
> 
> > On 07 October 2014 at 22:33 Guenter Roeck <linux@...ck-us.net> wrote:
> >
> >
> > On Tue, Oct 07, 2014 at 04:18:32PM -0400, David Miller wrote:
> > > From: Fabian Frederick <fabf@...net.be>
> > > Date: Tue,  7 Oct 2014 22:16:36 +0200
> > >
> > > > static values are automatically initialized to NULL
> > > >
> > > > Signed-off-by: Fabian Frederick <fabf@...net.be>
> > >
> > > Isn't there some implementation room given to compilers
> > > as to the representation of true and false?
> >
> > Not for true/false.
> >
> > C99 standard, section 7.16:
> >
> > ...
> > The remaining three macros are suitable for use in #if preprocessing
> > directives. They are
> >
> > true
> >
> > which expands to the integer constant 1,
> >
> > false
> >
> > which expands to the integer constant 0, and
> > ...
> >
> > No idea where the NULL comes into the picture, though.
> >
> > Guenter
> 
> Maybe comment should have been "static values are automatically initialized to
> 0" then ?

I think David's concern was whether if 0 == false in all situations. It
is pretty clear that static memory is initialized to 0.

Thanks,
Hannes


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