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    Subjectkexec boot regression

    I have this big box that takes forever to boot, so I use kexec to boot
    into new kernels. Works fine, but some time past 2.6.32 it stopped
    working. Instead of wasting brain cycles on finding out why, I handed
    the problem to my trusty regression friend - git bisect.

    This is what it found (sorry Yinghai it's you again, you owe me a beer
    for hours of 2.6.32-git bisecting ;-)

    99935a7a59eaca0292c1a5880e10bae03f4a5e3d is the first bad commit
    commit 99935a7a59eaca0292c1a5880e10bae03f4a5e3d
    Author: Yinghai Lu <>
    Date: Sun Oct 4 21:54:24 2009 -0700

    x86/PCI: read root resources from IOH on Intel

    For intel systems with multi IOH, we should read peer root resources
    directly from PCI config space, and don't trust _CRS.

    I could not revert this single commit, as a further commit made other
    changes. So I reverted 67f241f4 first and then 99935a7a. I confirmed
    that this kernel then works fine.

    With current -git, I get tons and tons of:

    [ 16.841724] pci 0000:00:01.0: BAR 7: no parent found for bridge [io
    [ 16.850368] pci 0000:00:01.0: BAR 7: can't allocate [io
    [ 16.857821] pci 0000:00:01.0: BAR 8: no parent found for bridge [mem
    [ 16.867238] pci 0000:00:01.0: BAR 8: can't allocate [mem
    [ 16.875492] pci 0000:00:02.0: BAR 7: no parent found for bridge [io
    [ 16.884137] pci 0000:00:02.0: BAR 7: can't allocate [io
    [ 16.891591] pci 0000:00:02.0: BAR 8: no parent found for bridge [mem
    [ 16.901010] pci 0000:00:02.0: BAR 8: can't allocate [mem
    [ 16.909264] pci 0000:00:03.0: BAR 7: no parent found for bridge [io
    [ 16.917908] pci 0000:00:03.0: BAR 7: can't allocate [io

    I can provide a full log if needed.

    Jens Axboe

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