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    SubjectRe: How to map high memory for block io
    Russell King wrote:

    > >
    > > I don't see what the problem is. A sg entry is a list of struct page
    > > pointers, an offset, and a size. As such, it can't describe a transfer
    > > which crosses a page because such a structure does not imply that one
    > > struct page follows another struct page.
    > >
    > >
    >

    If the pages do not strictly follow each other then there is a lot of
    broken code in the kernel. drivers/mmc/mmci.c and drivers/block/ub.c
    being two occurences since both assume they can access the entire entry
    through a single mapping.

    Rgds
    Pierre


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