linux-kernel - Re: [PATCH] kbuild: implement modules.order, take #2

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Message-ID: <20071209081138.GB4954@uranus.ravnborg.org>
Date:	Sun, 9 Dec 2007 09:11:38 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, notting@...hat.com,
	rusty@...tcorp.com.au, kay.sievers@...y.org,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH] kbuild: implement modules.order, take #2

On Fri, Dec 07, 2007 at 09:04:30PM +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.
> 
> When driver modules are loaded by udev, what comes first in
> modules.alias file is selected.  However, the order in this file is
> indeterministic (depends on filesystem listing order of installed
> modules).  This causes confusion.
> 
> The solution is two-parted.  This patch updates kbuild such that it
> generates and installs modules.order which contains the name of
> modules ordered according to Makefile.  The second part is update to
> depmod such that it generates output files according to this file.
> 
> Note that both obj-y and obj-m subdirs can contain modules and
> ordering information between those two are lost from beginning.
> Currently obj-y subdirs are put before obj-m subdirs.
> 
> Sam Ravnborg cleaned up Makefile modifications and suggested using awk
> to remove duplicate lines from modules.order instead of using separate
> C program.
> 
> Signed-off-by: Tejun Heo <htejun@...il.com>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: Bill Nottingham <notting@...hat.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Greg Kroah-Hartman <gregkh@...e.de>
> Cc: Kay Sievers <kay.sievers@...y.org>

Applied to kbuild.git.

	Sam
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