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    SubjectRe: [bug] ata subsystem related crash with latest -git
    Linus Torvalds wrote:
    > Very few drivers should care so much about the *page* itself (or the
    > offset). That's something that the generic allocation code etc cares
    > about, but the driver is almost bound to care mostly about the actual DMA
    > address, so adding that helper function that abstracts the sg access would
    > be helpful in hiding some of the cruft?


    FWIW libata cares about both. When doing DMA, it cares about the DMA
    address. When doing PIO, it cares about the actual page, because it
    does a kmap before sending the data through a 16-bit/32-bit data FIFO.

    Jeff


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