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Message-ID: <alpine.LFD.1.10.0805081557580.2940@woody.linux-foundation.org>
Date: Thu, 8 May 2008 16:00:13 -0700 (PDT)
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Rene Herman <rene.herman@...access.nl>
cc: Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: GIT bisection range errors
On Fri, 9 May 2008, Rene Herman wrote:
>
> I'm in a git bisect and am experiencing strangeness. I did a
>
> $ git checkout -b rc v2.6.26-rc1
> $ git bisect start
> $ git bisect bad
> $ git bisect good v2.6.25
>
> Yet, during this I'm finding myself at 2.6.25-rc6 and 2.6.25-rc8
> as the last two results (both good...).
This is very normal.
Why?
Because a lot (in fact, *most*) of the code that was merged after v2.6.25
was released was actually *written* and committed long before v2.6.25.
It just got merged into my tree much later.
So what happens? The bisection run starts walking into all that history,
and that history is *not* based on the released v2.6.25 at all, it's based
on much earlier kernels (eg the -rc kernels).
So what you see is perfectly normal and expected. It's only unexpected if
you think of history as a linear thing, but it isn't - it's full of
merging of code that was branched off from (much) earlier code points.
Linus
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