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    SubjectRe: [PATCH] x86/pci: don't use crs for root if we only have one root bus
    On Wed, 24 Jun 2009 16:21:09 -0700 (PDT)
    Linus Torvalds <> wrote:

    > On Wed, 24 Jun 2009, Linus Torvalds wrote:
    > >
    > > I'm happy to apply various patches to fix it up, but regardless, I
    > > thinkwe should revert that commit as bogus. We can try making it
    > > the default again next round, when maybe it will be true that it
    > > doesn't cause issues.
    > Btw, I really think our _CRS handling sucks.
    > There's two things that you can do with _CRS:
    > - use the _existence_ of it as an indicator of a root bus
    > - try to use it to populate the resource tree.
    > And quite frankly, I think #2 is broken. There's no way in hell that
    > ACPI tables are ever going to be better than just asking the
    > hardware. We've gone through this before. Trusting ACPI over the
    > hardware is just FUNDAMENTALLY WRONG.
    > So I'm just going to do that revert. I'm not sure if it ever makes
    > sense to make that insane _CRS code the default. It seems like a
    > fundamentally flawed idea.

    Yeah, I think it's reasonable to revert, especially given how we do
    _CRS handling currently. I'm hoping at some point we can use the _CRS
    data to at least augment the configuration we get from hardware, since
    on some machines it seems to be necessary.

    Jesse Barnes, Intel Open Source Technology Center

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