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    SubjectRe: How to map high memory for block io
    On Fri, Jan 27, 2006 at 01:14:15PM +0100, Pierre Ossman wrote:
    > Russell, would having a "highmem not supported" flag in the host
    > structure be an acceptable solution? mmc_block could then use that to
    > tell the block layer that bounce buffers are needed. As for other,
    > future, users they would have to take care not to give those drivers
    > highmem sg lists.

    The mmc_block layer only tells the block layer what the driver told it.

    > The current buggy code, was modeled after another MMC driver (mmci). So
    > I suspect there might be more occurrences like this. Perhaps an audit
    > should be added as a janitor project?

    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.

    Russell King
    Linux kernel 2.6 ARM Linux -
    maintainer of: 2.6 Serial core
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      Last update: 2006-01-27 20:45    [W:0.019 / U:38.404 seconds]
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