linux-kernel - Re: CPA boot crash (was: [PATCH] [0/36] Great change_page

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Message-ID: <20080118155650.GA20054@elte.hu>
Date:	Fri, 18 Jan 2008 16:56:50 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	jbeulich@...ell.com, venkatesh.pallipadi@...el.com
Subject: Re: CPA boot crash (was: [PATCH] [0/36] Great change_page_attr
	patch series v3)


* Ingo Molnar <mingo@...e.hu> wrote:

> hm, i just found a failing 64-bit .config while testing your CPA 
> patchset:
> 
>  [    1.916541] CPA mapping 4k 0 large 2048 gb 0 x 0[0-0] miss 0
>  [    1.919874] Unable to handle kernel paging request at 000000000335aea8 RIP:
>  [    1.919874]  [<ffffffff8021d2d3>] change_page_attr+0x3/0x61
>  [    1.919874] PGD 0
>  [    1.919874] Oops: 0000 [1]
>  [    1.919874] CPU 0
> 
> config and full crash.log attached. Fully reproducible. I've also 
> pushed out the current x86.git with the new CPA bits included.

hm, and your CPA queue is no bisectable, due to:

  Subject: Undo pat cpa patch
  From: Andi Kleen <ak@...e.de>

  Going to implement this differently

    commit 5ec5c5a2302ca8794da03f8bedec931a2a814ae9
    Author: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
    Date:   Tue Jan 15 09:36:03 2008 +0100

       patches/x86-pat-cpa_i386.patch

could you please make your queue bisectable?

Also, did you actually try to port your queue ontop of the cleanups 
patch? There's an easy technique: first do an undo patch, then apply 
your patch, then apply the re-do patch. Whatever rejects come from the 
re-do patch can be dropped from the cleanup. Continue with this until 
all patches are covered. Then generate the undo+your-old-patch+redo 
patch into a single your-new-patch.

	Ingo
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