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

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Message-ID: <20141008094620.GA12270@unicorn.suse.cz>
Date:	Wed, 8 Oct 2014 11:46:20 +0200
From:	Michal Kubecek <mkubecek@...e.cz>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	'Hannes Frederic Sowa' <hannes@...essinduktion.org>,
	Fabian Frederick <fabf@...net.be>,
	Guenter Roeck <linux@...ck-us.net>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1 net-next] af_unix: remove NULL assignment on static

On Wed, Oct 08, 2014 at 09:10:23AM +0000, David Laight wrote:
> From: Hannes Frederic Sowa
> > I think David's concern was whether if 0 == false in all situations. It
> > is pretty clear that static memory is initialized to 0.
> 
> I'm not 100% sure about that.
> static pointers may be required to be initialised to NULL.

ISO C 99 says:

  If an object that has static storage duration is not initialized
  explicitly, then:
  - if it has pointer type, it is initialized to a null pointer;
  - if it has arithmetic type, it is initialized to (positive or
    unsigned) zero;
  - if it is an aggregate, every member is initialized (recursively)
    according to these rules;
  - if it is a union, the first named member is initialized
    (recursively) according to these rules.

Michal Kubeček

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