linux-kernel - Re: 2.6.21-rc1: known regressions (part 2)

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Message-ID: <20070302072100.GB30634@elte.hu>
Date:	Fri, 2 Mar 2007 08:21:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Pavel Machek <pavel@....cz>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: 2.6.21-rc1: known regressions (part 2)


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> But most likely, 9f4bd5dd is actually already bad, and what you are 
> seeing is two *different* bugs that just have the same symptoms 
> ("suspend doesn't work").

the situation is simpler than that: there is a /known/ bug, and i marked 
the bugfix commit as 'good'. I never met such a multiple-bugs scenario 
before and forgot that git-bisect could easily pick a tree without this 
essential bugfix and would not be able to make a distinction between the 
two types of badness.

I'll try what i've described in the previous mail: mark all bisection 
points that do not include f3ccb06f as 'good' - thus 'merging' the 
known-bad area with the first known-good commit, and thus eliminating it 
from the bisection space.

(but it might also be useful to have a "git-bisect must-include" kind of 
command that would allow this to be automated: mark a particular tree as 
an essential component of the search space.)

	Ingo
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