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    SubjectRe: [PATCH] [RFC][V3] bluegene: use MMU feature flag to conditionalize L1 writethrough code
    On Thu, Jun 9, 2011 at 6:42 PM, Benjamin Herrenschmidt
    <benh@kernel.crashing.org> wrote:
    > On Thu, 2011-06-09 at 09:58 -0500, Eric Van Hensbergen wrote:
    >> On Tue, Jun 7, 2011 at 7:47 PM, Benjamin Herrenschmidt
    >> <benh@kernel.crashing.org> wrote:
    >> > BTW. Care to explain to me why you have U2 -both- in the arguments to
    >> > tlbwe and in MMUCR ? That doesn't look right to me... which one is used
    >> > where and when ?
    >> >
    >>
    >> My reading of the databook is that U2SWOAE is an enable bit that lets the U2
    >> storage attribute control the behavior.
    >
    > You mean the MMUCR variant ?
    >

    Yeah, the MMCR variant acts as an enable/mask for the U2 storage attribute.

    >
    > Well, point is, parsing the device-tree from early boot asm is nasty,
    > unless you start extending the header but that sucks. That's why I'm
    > thinking it might be a good idea to look at what it takes to "convert"
    > the initial entry instead, even if that involves some cache flushing
    > (provided that's workable at all of course).
    >

    ah, okay. I guess if its happening before the secondary cpus come up
    then that should be workable. I guess it doesn't hurt to try.

    -eric


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