linux-kernel - Re: [Intel-gfx] agp/intel: can't ioremap flush page

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Date:	Fri, 7 Mar 2014 09:55:43 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Steven Newbury <steve@...wbury.org.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [Intel-gfx] agp/intel: can't ioremap flush page - no chipset flushing

On Fri, Mar 7, 2014 at 2:48 AM, Paul Bolle <pebolle@...cali.nl> wrote:
> Bjorn Helgaas schreef op ma 10-02-2014 om 14:33 [-0700]:
>> I wouldn't start bisecting yet, but if you're in the mood, this
>> commit: 96702be56037 "Merge branch 'pci/resource' into next" looks
>> like a good place to start, so you could try the pre-merge commit:
>> 04f982beb900 "Merge branch 'pci/msi' into next".  If 04f982beb900 is
>> good, there are only about 15 commits on the pci/resource branch to
>> look at.
>
> This might end up not being relevant. And this is surely documented
> somewhere, but anyhow:
> - what git magic returns the hashes of the 15 commits that merge commit
>   96702be56037 added to the tree; and

"git show 96702be56037" gives:

    commit 96702be560374ee7e7139a34cab03554129abbb4
    Merge: 04f982beb900 d56dbf5bab8c
    ...

04f982beb900 is the previous HEAD, d56dbf5bab8c is the head of the
branch merged by this commit.  "git log 04f982beb900..96702be56037"
shows the commits merged.

> - how can I use the list of those hashes to limit the range of commits
>   to do a git bisect?

I'm not a git bisect expert, but I *think* you should be able to do
something like this:

    git bisect start
    git bisect bad 96702be56037
    git bisect good 04f982beb900

(assuming you've verified that 96702be56037 really *is* bad and
04f982beb900 really *is* good), and git should checkout something in
the middle and you can build and test it, then use "git bisect good"
or "git bisect bad" depending on the result.

Bjorn
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