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Message-ID: <4AD74A2A.3090506@gmail.com>
Date: Thu, 15 Oct 2009 12:13:30 -0400
From: Gregory Haskins <gregory.haskins@gmail.com>
User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812)
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To: Randy Dunlap <rdunlap@xenotime.net>
CC: Daniel Walker <dwalker@fifo99.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Tips for module_init() dependencies
References: <4AD71D12.9060203@gmail.com>	<1255621559.22917.35.camel@desktop>	<4AD7469B.9070907@gmail.com> <20091015090645.140e04f4.rdunlap@xenotime.net>
In-Reply-To: <20091015090645.140e04f4.rdunlap@xenotime.net>
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Randy Dunlap wrote:
> On Thu, 15 Oct 2009 11:58:19 -0400 Gregory Haskins wrote:
>=20
>> Daniel Walker wrote:
>>> On Thu, 2009-10-15 at 09:01 -0400, Gregory Haskins wrote:
>>>
>>>> may break, because the kernel seems to have no concept of
>>>> interdependency between foo_init() and bar_init(), and therefore
>>>> bar_init() may call foo() before foo_init() has executed.
>>>>
>>>> There are various ways to solve this problem, such as deferring call=
ing
>>>> foo() with a workqueue or something, but I was wondering if there wa=
s a
>>>> better/standard way to do this that I am missing?
>>>>
>>>> The problem I am having specifically is that I am trying to call
>>>> configfs_register_subsystem() in a module_init(), but this breaks wh=
en
>>>> built into the kernel based on sheer bad luck that configfs gets
>>>> initialized after me.  To date I have worked around this by forcing =
my
>>>> code to only support built-in, and using late_initcall() instead or
>>>> module_init.  This works, but it only means I am putting the problem=
 off
>>>> (code that depends on *me* has to use similar tricks, etc.
>>> You can't modify the build order so your module get "builtin" after
>>> configfs?
>>>
>> Hi Daniel,
>>
>> Possibly.
>>
>> A) Any suggestions on how? Can I express this in Kconfig or something
>> (i.e. "depends on FOO").  I currently have "select FOO" in the BAR
>> object, but this doesn't seem to be sufficient to describe the relatio=
nship.
>=20
> Not in Kconfig, only in Makefile(s).
> and please put #comments in them explaining the ordering requirements/n=
eeds.

Hi Randy,

Something like this?

----------

# cat drivers/bar/Makefile

bar.o: foo.o
obj-$CONFIG_BAR +=3D bar.o

----------

?

Kind Regards,
-Greg


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