linux-kernel - Re: [rfc 45/45] Modules: Hack to handle symbols that have a zero value

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Message-ID: <Pine.LNX.4.64.0711191849180.21479@schroedinger.engr.sgi.com>
Date:	Mon, 19 Nov 2007 18:49:56 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	ak@...e.de, akpm@...ux-foundation.org, travis@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc 45/45] Modules: Hack to handle symbols that have a zero
 value

On Mon, 19 Nov 2007, Mathieu Desnoyers wrote:

> * clameter@....com (clameter@....com) wrote:
> > The module subsystem cannot handle symbols that are zero. It prints out
> > a message that these symbols are unresolved. Define a constant
> > 
> > UNRESOLVED
> > 
> > that is used to hold the value used for unresolved symbols. Set it to 1
> > (its hopefully unlikely that a symbol will have the value 1). This is necessary
> > so that the pda variable which is placed at offset 0 of the per cpu
> > segment is handled correctly.
> > 
> 
> Wouldn't it be better to simply return a standard ERR_PTR(-ENO....) ?

Good idea. But can you guarantee that this wont clash with an address?

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