linux-kernel - Re: [PATCH 00/34] _

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Message-Id: <20070209133355.d5df1ab5.akpm@linux-foundation.org>
Date:	Fri, 9 Feb 2007 13:33:55 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Alon Bar-Lev <alon.barlev@...il.com>,
	linux-kernel@...r.kernel.org, bwalle@...e.de,
	rmk+lkml@....linux.org.uk, spyro@....com, davej@...emonkey.org.uk,
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	linux-serial@...r.kernel.org
Subject: Re: [PATCH 00/34] __initdata cleanup

On Fri, 9 Feb 2007 18:37:34 +0100 (CET)
Roman Zippel <zippel@...ux-m68k.org> wrote:

> Hi,
> 
> On Fri, 9 Feb 2007, Heiko Carstens wrote:
> 
> > And indeed all the __initdata annotated local and global variables on
> > s390 are in the init.data section. So I'm wondering what this patch
> > series is about. Or I must have missed something.
> 
> I think it reaches back to times when gcc 2.7.* was still supported, which 
> does behave as described in the documentation. gcc 2.95 and newer don't 
> require explicit initialization anymore, so this has become a non-issue.
> 

Yes, nobody's been observing any problems arising from this, and if this
memory was really uninitialised, people would be hitting problems.

I don't want to have to require that all __attribute__((section)) storage
be initialised - people will surely forget to do it and things will slip
through.

If we really do have a problem here it'd be better to fix it in some
central and global fashion: either by ensuring that each architecture's
startup code will zero this memory or by some compiler/linker option such
as -fno-common.

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