linux-kernel - Re: Forked android kernel development from linux kernel mainline

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Message-ID: <20101110105333.6ef067f2@schatten.dmk.lab>
Date:	Wed, 10 Nov 2010 10:53:33 +0100
From:	Florian Mickler <florian@...kler.org>
To:	Ted Ts'o <tytso@....edu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Elvis Dowson <elvis.dowson@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Forked android kernel development from linux kernel mainline

On Tue, 9 Nov 2010 19:35:24 -0500
Ted Ts'o <tytso@....edu> wrote:

> On Tue, Nov 09, 2010 at 10:32:25PM +0000, Alan Cox wrote:
> > > Ah, but if you make changes to the android userspace that aren't
> > > accepted upstream by the core android development team, you'll be
> > > forking the android userspace.  And given that they are continuing to
> > 
> > Oh so forking the kernel is fine but forking userspace is silly. Quaint
> OTOH, if the original poster thinks that he can develop changes to the
> Android userspace that allow the use of an upstream kernel, and has
> just as good battery lifetime, and with a system which is just as
> debuggable and easy to maintain as the current android userspace, then
> by all means, I would love for him to try to prove that he can.  And I
> will certainly be happy to introduce him to the Android developers who
> measure power usage in mobile devices using microwatt meters to see if
> he really can do as good of a job using a stock kernel.
> 
> So Elvis, if you think you can, please consider this a challenge!  :-)
> 
> Or if he just wants to get the drivers into mainline so that other
> non-Android devices can use those particular chipsets, that's good
> too.  I just hope that he can do appropriate testing so that he can be
> a good maintainer for the drivers, which means testing them.  Pushing
> code that may or may not work isn't necessarily an improvement!
> 
>        	  	    	       	     	      - Ted

I don't think _maintaining_ a fork is currently necessary or worthwile.
But what could be useful as a proove of concept, would be to try to
express the original wake-lock api (the one that is currently in use on
android) in terms of the mechanisms currently in mainline.

That way, Rafael would probably get useful feedback on
pm_wakeup_event() (and friends) implementation.

Regards,
Flo

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