linux-kernel - Re: [PATCH 5/6] module: make modversion_info contain a pointer, not an array.

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Message-ID: <20090128144114.4aeaa0ff@infradead.org>
Date:	Wed, 28 Jan 2009 14:41:14 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	Shawn Bohrer <shawn.bohrer@...il.com>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: [PATCH 5/6] module: make modversion_info contain a pointer, not
 an array.

On Thu, 29 Jan 2009 08:59:40 +1030
Rusty Russell <rusty@...tcorp.com.au> wrote:

> On Thursday 29 January 2009 01:22:31 Arjan van de Ven wrote:
> > On Thu, 29 Jan 2009 00:05:52 +1030
> > Rusty Russell <rusty@...tcorp.com.au> wrote:
> > 
> > > 
> > > With allmodconfig (minus non-building modules) on 32-bit x86:
> > > Total size of modules before: 60009790 bytes
> > > Total size of modules after: 55927866 bytes
> > > 
> > > Saving 7% of module size for CONFIG_MODVERSIONS=y; and these
> > > sections are kept resident as well.
> > > 
> > 
> > that reminds me.. can we just simplify MODVERSIONS to be a md5sum
> > (or sha1 whatver) of the .config file in the VERMAGIC ?
> > it's a lot more reliable in detecting incompatibilities, and a lot
> > less space consumed.
> 
> Unfortunately people really seem to want the finer granularity that
> MODVERSIONS (sometimes) provides :(  I've tried killing it off
> several times, and always failed.

but we could just stick the result in VERMAGIC right?
rather than tacking it to every symbol.

how you calculate the global checksum is almost a separate debate.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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