linux-kernel - Re: [3.8-rc4 arm] SCSI_SYM53C8XX

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Date:	Tue, 22 Jan 2013 09:03:26 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	rob.herring@...xeda.com, grant.likely@...retlab.ca,
	rmk+kernel@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [3.8-rc4 arm] SCSI_SYM53C8XX_2 module cannot register IRQ

On Sun, Jan 20, 2013 at 1:24 PM, Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:

> While (1) was fixed by now, I can't bisect (2) since (1) is preventing (2) from
> printing messages.

I usually bisect like this:

1.  Get hold of the patch fixing the boot regression:
    git format-patch
f5565295892eb93c3191aa241405fe8b685542d6^..f5565295892eb93c3191aa241405fe8b685542d6

2. At each iterative step using git bisect:
   patch -p1 < 0001-ARM-7610-1-versatile-bump-IRQ-numbers.patch

3. Boot/trial-and-horror

4. git reset --hard HEAD
   To nullify the effects of the patch.

5. git bisect [good|bad]

6. Iterate from (2) until you find the bug.

Yours,
Linus Walleij
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