linux-kernel - Re: [BUG] 2.6.23-rc3 can't see sd partitions on Alpha

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Message-ID: <20071207114048.GB14598@elte.hu>
Date:	Fri, 7 Dec 2007 12:40:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Bob Tracy <rct@...s.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, mcree@...on.net.nz,
	linux-kernel@...r.kernel.org, rjw@...k.pl, rth@...ddle.net,
	ink@...assic.park.msu.ru, linux-scsi@...r.kernel.org,
	kay.sievers@...y.org, greg@...ah.com
Subject: Re: [BUG] 2.6.23-rc3 can't see sd partitions on Alpha


* Bob Tracy <rct@...s.com> wrote:

> > I'm struggling to see how any of those could have broken block 
> > device mounting on alpha.  Are you sure you bisected right?
> 
> Based on what's in that commit, it *does* appear something went wrong 
> with bisection.  If the implicated commit is the next one in time 
> sequence relative to
> 
> # good: [2f1f53bdc6531696934f6ee7bbdfa2ab4f4f62a3] CRISv10 fasttimer: Scrap INLINE and name timeval_cmp better
> 
> then the test of whether I bisected correctly is as simple as applying 
> the commit and seeing if things break, because I'm running on the 
> kernel corresponding to 2f1f53bdc6531696934f6ee7bbdfa2ab4f4f62a3 right 
> now.  Let me give that a try and I'll report back.  Worst case, I'll 
> have to start over and write off the past four days...

generally it's easier to just go "back in time" and re-try the last 
known "good" and last-known "bad" commit IDs to establish that they are 
indeed correctly identified. if they are not then step back one more in 
the bisection log. No need to spend another 4 days on this, if most of 
the bisection is OK. You can replay a corrected git bisection log 
quickly, by doing:

  git-bisect reset
  git-bisect < bisect.log

	Ingo
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