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    SubjectRe: How to map high memory for block io
    Russell King wrote:
    > On Thu, Mar 02, 2006 at 08:26:50AM +0100, Pierre Ossman wrote:
    >
    >> Russell King wrote:
    >>
    >>> Okay, I've hit this same problem (but in a slightly different way) with
    >>> mmci.c. The way I'm proposing to fix this for mmci is to introduce a
    >>> new capability which says "clustering is supported by this driver."
    >>>
    >> This will decrease performance more than necessary for drivers that can
    >> do clustering, just not in highmem. So what about another flag that says
    >> "highmem is supported by this driver"?
    >>
    >
    > I think you're asking Jens that question - I know of no way to tell
    > the block layer that clustering is fine for normal but not highmem.
    >
    >

    That wasn't what I meant. What I was referring to was disabling highmem
    altogether, the way that is done now through looking at the dma mask.

    Rgds
    Pierre

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