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SubjectRe: CONFIG_BIGMEM and rawio
"Stephen C. Tweedie" wrote:
> If we have a himem-enabled page cache,
> then these old devices may well require bounce buffers. When we
> introduce support for 64G addressing, even today's scsi controllers will
> need bounce buffers until all of the drivers are updated for DAC pci
> addressing.
Is that planed for 2.4?

> It _is_ short. It is doing the same job that the swap code does. The
> point is to avoid having to re-implement the swap code over and over
> again, once for raw IO, once for the page cache --- better just to move
> the existing mechanism into the general-purpose IO code.

IIRC, Linus said that he would accept (non-block) device drivers which
use map_user_kiobuf(). So I think we'll need a "bounce_user_kiobuf(..)"
function anyway.

--
Manfred

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