linux-kernel - Re: [patch 03/26] Dynamic kernel command-line

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Date:	Mon, 22 Jan 2007 23:14:00 +0100
From:	Bernhard Walle <bwalle@...e.de>
To:	Tomas Carnecky <tom@...ervice.com>, linux-kernel@...r.kernel.org,
	Alon Bar-Lev <alon.barlev@...il.com>
Subject: Re: [patch 03/26] Dynamic kernel command-line - arm

* Russell King <rmk+lkml@....linux.org.uk> [2007-01-18 16:23]:
> On Thu, Jan 18, 2007 at 04:31:51PM +0100, Tomas Carnecky wrote:
> > Russell King wrote:
> > > On Thu, Jan 18, 2007 at 01:58:52PM +0100, Bernhard Walle wrote: 
> > >> -static char command_line[COMMAND_LINE_SIZE];
> > >> +static char __initdata command_line[COMMAND_LINE_SIZE];
> > > 
> > > Uninitialised data is placed in the BSS.  Adding __initdata to BSS
> > > data causes grief.
> > > 
> > 
> > Static variables are implicitly initialized to zero. Does that also
> > count as initialization?
> 
> No.  As I say, they're placed in the BSS.  The BSS is zeroed as part of
> the C runtime initialisation.
> 
> If you want to place a variable in a specific section, it must be
> explicitly initialised.  Eg,
> 
> static char __initdata command_line[COMMAND_LINE_SIZE] = "";

Why? It must be initialised if you rely on a initialised value in the
code. But I don't think that this in in case here. Can you tell me the
code where you read from command_line before writing to it?

Thanks.


Regards,
Bernhard
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