linux-kernel - Re: [PATCH] depmod: sort output according to modules.order

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Date:	Wed, 05 Dec 2007 16:33:38 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>, notting@...hat.com,
	rusty@...tcorp.com.au, kay.sievers@...y.org, greg@...ah.com
Subject: Re: [PATCH] depmod: sort output according to modules.order

Sam Ravnborg wrote:
> Hi Tejun.
> On Tue, Dec 04, 2007 at 10:55:48PM +0900, Tejun Heo wrote:
>> Kbuild now generates and installs modules.order along with modules.
>> This patch updates depmod such that it sorts module list according to
>> the file before generating output files.  Modules which aren't on
>> modules.order are put after modules which are ordered by
>> modules.order.
>>
>> This makes modprobe to prioritize modules according to kernel
>> Makefile's just as built-in modules are link-ordered by them.
> 
> With this change depmod require the precense of modules.order.
> Could we make it optional so depmod are backward compatible?

It is backward compatible by virtue of

+		if (errno == ENOENT)
+			return;

in sort_modules().  If the file isn't there, the list isn't sorted.

> It would also simplify the kbuild integration if depmod
> could read the modules as a space separated list where
> duplicates are allowed.
> If we do so then the is no reason to escape to the shell
> in Makeilfe.build and we do not have to remove duplicates either.

I'm no Makefile expert so no doubt my modifications are ugly.  But I
think producing a file w/ duplicates in it is just ugly.

-- 
tejun
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