linux-kernel - Re: current git kernel has strange problems during bisect

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Message-ID: <20090115165425.GA7517@bombe-desk.opditex>
Date:	Thu, 15 Jan 2009 17:54:25 +0100
From:	Andreas Bombe <andreas.bombe@...um.de>
To:	Kyle Moffett <kyle@...fetthome.net>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Johannes Schindelin <Johannes.Schindelin@....de>,
	git@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: current git kernel has strange problems during bisect

On Tue, Jan 13, 2009 at 03:26:09PM -0500, Kyle Moffett wrote:
> On Sun, Jan 11, 2009 at 4:39 PM, Christian Borntraeger
> <borntraeger@...ibm.com> wrote:
> > In my opinion we should really avoid subtree merges in the future as a curtesy
> > to people who do the uncool work of testing, problem tracking and bisecting.
> > </rant>
> 
> As an alternative, you can relatively easily rewrite the following
> independent histories:
> 
> A -- B -- C
> X -- Y -- Z
> 
> To look like this:
> 
> A -- B -- C -- X' -- Y' -- Z'
> 
> Where X' is (C + sub/dir/X), Y' is (C + sub/dir/Y), etc...

Given that the subtree may have been in development for a long time, it
is almost a certainty that the older commits may compile on A but not
on C.  By basing it all on C you create a lot of uncompilable commits
which hurt bisection just as bad.  At least with missing kernel sources
it is obvious that an attempt at compilation is futile and a waste of
time.
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