Date: Thu, 01 May 2003 06:13:57 -0400
From: rmoser <mlmoser@comcast.net>
Subject: Re: Kernel source tree splitting
In-reply-to: <32822.4.64.196.31.1051757471.squirrel@www.osdl.org>
To: "Randy.Dunlap" <rddunlap@osdl.org>
Cc: linux-kernel@vger.kernel.org
Message-id: <200305010613570940.000BF85B@smtp.comcast.net>
MIME-version: 1.0
Content-type: text/plain; charset=us-ascii
Content-transfer-encoding: 7BIT
References: <200304301946130000.01139CC8@smtp.comcast.net>
 <20030430172102.69e13ce9.rddunlap@osdl.org>
 <200304302044410090.01492640@smtp.comcast.net>
 <32822.4.64.196.31.1051757471.squirrel@www.osdl.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 3216
Lines: 96


*********** REPLY SEPARATOR  ***********

On 4/30/2003 at 7:51 PM Randy.Dunlap wrote:

>> On 4/30/2003 at 5:21 PM Randy.Dunlap wrote:
>>
>>>Hi,
>>>
>>>I'm probably misreading this...but,
>>>
>>>Have you tried this yet?  Does it modify/customize all Kconfig
>>>and Makefiles for the selected tree splits?
>>>
>>
>> I didn't try it.  It would require knowledge of all interdependencies
>> between modules (i.e. ide-scsi is part of ide.  ide-scsi depends
>> on scsi), also all source files that belong to each config option
>> would likely need to be understood by the persons working to
>> do this, and also the entire build system semantics would need
>> to be designed to work in pieces.  Assuming this is ever done.
>>
>> It goes like this:
>>
>> make *config reads kernel-tree/options/foo.lod
>> make *config gets to configuration baz in bar.lod
>> make *config sees baz needs foo
>> make *config lists baz.
>> make *config sees biz needs data
>> make *config refuses to show biz
>> make missing-depends shows a list of unselectable options and
>> -----------selecting one tells which kernel option is needed.
>> make bzImage reads through kernel-tree/options/ and finds which
>> -----------makefiles to call (current makes have these embedded)
>> make bzImage builds a kernel.
>> make modules reads through kernel-tree/options/ and finds which
>> -----------makefiles to call.
>> make modules builds a kernel.
>>
>>>A few days ago, in one tree, I rm-ed arch/{all that I don't need} and
>>> drivers/{all that I don't need}.
>>>After that I couldn't run "make *config" because it wants all of
>>>those files, even if I don't want them.
>>>
>>
>> That WILL break something.
>
>or "That does break something"  (when I tried it).
>
>>>So there are many edits that needed to be done in lots of
>>>Kconfig and Makefiles if one selectively pulls or omits certain
>>>sub-directories.
>>>
>>
>> The main Makefile will have to be redone.  So would the kconfig
>> things (make config/menuconfig/xconfig).
>>
>> The extra plus to this is that other people can steal the build
>> system for other projects lol.
>
>I seem to try for simple solutions when possible and feasible.
>
>In this case, if I were doing it, I would try changing (e.g.) in
>arch/i386/kernel/Kconfig, this line:
>source "drivers/eisa/Kconfig"
>to
>optsource "drivers/eisa/Kconfig"
>where optsource means that the file is optional -- if not found,
>ignore it.  And then see what happens, how far it can go,
>what the next problem is....
>
>If this could be made to work, then entire subdirectories/subsystems
>could be optional.
>

Yeah but hat about things that came out of nowhere, i.e. a piece of
hardware compes with a linux driver source?

>~Randy
>
>
>
>-
>To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>Please read the FAQ at  http://www.tux.org/lkml/


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/