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Date:	Fri, 20 Jun 2008 12:17:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kevin Winchester <kjwinchester@...il.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>
Subject: Re: Bisecting tip/auto-x86-next?


* Kevin Winchester <kjwinchester@...il.com> wrote:

> Hi,
>
> I am trying to track down a problem I reported here:
>
> http://lkml.org/lkml/2008/6/11/431

  [ GART related bootup crash. ]

> None or you were cc'd on the original report because I had no idea of 
> the source of the issue.  However, I have now narrowed down the 
> problem to the auto-x86-next tree.  Thus I did something like:
>
> $ git bisect start
> $ git bisect good linus/master
> $ git bisect bad tip/auto-x86-next

ok, in that case you can use tip's topical structure and probably bisect 
purely x86/gart, which has all x86 gart changes.

I.e. do something like this:

  git-checkout tip/x86/gart

build and boot that kernel, if it fails and mainline works then do:

  git-bisect reset
  git-bisect start
  git-bisect good linus/master
  git-bisect bad tip/x86/gart

this should drastically reduce the number of bisection steps needed, to 
3 or 4 iterations.

	Ingo
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