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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