linux-kernel - Re: [patch 5/3] fastboot: sync the async execution before late

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Message-ID: <48D0310E.1040409@am.sony.com>
Date:	Tue, 16 Sep 2008 15:19:58 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Greg KH <greg@...ah.com>
CC:	Simon Arlott <simon@...e.lp0.eu>,
	Alan Stern <stern@...land.harvard.edu>,
	Rene Herman <rene.herman@...access.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Daniel Walker <dwalker@...sta.com>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [patch 5/3] fastboot: sync the async execution before	late_initcall
 and move level 6s (sync) first

Greg KH wrote:
> On Thu, Jul 31, 2008 at 07:29:21PM +0100, Simon Arlott wrote:
>>>> There is nothing else to run between 1-2 and 3, so there is no 
>>>> opportunity
>>>> to initialise devices in the background and usblp_init blocks for a 
>>>> while.
>>> If it were a module then it would block in a separate thread and wouldn't 
>>> hold up the main init process.
>> Right, but I want to compile all of this into the kernel.
> 
> Why?  It sounds like a trivial solution for you is to actually use
> modules.  Why go through a lot of extra work to solve something in a
> different way that is already solved for you?
> 
> Who is imposing the "no modules allowed" rule on you, and why was it
> made?

Sorry for the massively late response.

Don't know how I missed this thread earlier, but I can answer that
from my standpoint.

At Sony we have a "no modules if possible" policy to reduce kernel
footprint.  The size difference for a kernel compiled with modules
vs one with external modules is about 10% IRRC.
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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