linux-kernel - Re: [PATCH] kbuild: implement modules.order

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Message-ID: <20071208142831.GB20441@stusta.de>
Date:	Sat, 8 Dec 2007 15:28:31 +0100
From:	Adrian Bunk <bunk@...nel.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	sam@...nborg.org, Linux Kernel <linux-kernel@...r.kernel.org>,
	notting@...hat.com, rusty@...tcorp.com.au, kay.sievers@...y.org,
	greg@...ah.com
Subject: Re: [PATCH] kbuild: implement modules.order

On Sat, Dec 08, 2007 at 08:59:31AM +0900, Tejun Heo wrote:
> Adrian Bunk wrote:
> > On Tue, Dec 04, 2007 at 10:49:37PM +0900, Tejun Heo wrote:
> >> When multiple built-in modules (especially drivers) provide the same
> >> capability, they're prioritized by link order specified by the order
> >> listed in Makefile.  This implicit ordering is lost for loadable
> >> modules.
> >> ...
> > 
> > What exactly are the drivers you are thinking of?
> > 
> > I would rather see us getting away from any link order dependencies.
> > 
> > E.g. we might one day want to compile the whole kernel with one gcc call 
> > (using "--combine -fwhole-program").
> 
> The following bugzilla triggered this change and I think contains enough
> discussion on the subject.
> 
>   http://bugzilla.kernel.org/show_bug.cgi?id=8933
> 
> Thanks.

Thanks, that explains much.

And thinking about it, it doesn't seem to add any problems regarding 
what I have in mind:

If we would ever stop having any well-defined link-order for in-kernel 
code and express everything through initcall levels, we simply must 
additionally update the modules.order file.

> tejun

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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