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

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D174C6CA5@AcuExch.aculab.com>
Date:	Wed, 8 Oct 2014 09:10:23 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Hannes Frederic Sowa' <hannes@...essinduktion.org>,
	Fabian Frederick <fabf@...net.be>
CC:	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

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.
If NULL isn't the 'all 0 bit pattern' then the memory would need
to be initialised to a different pattern.
Not that anyone is likely to implement such a system because far too
much code will break.

The only system I knew where 'native' NULL pointers were 'all 1s'
used 0 in its C compiler.

	David