On Thu, 18 Oct 2007 09:55:04 -0700 (PDT)
Linus Torvalds <[email protected]> wrote:
>
>
> On Thu, 18 Oct 2007, Jens Axboe wrote:
> > - unsigned long addr = page_to_phys(s->page) +
> > s->offset;
> > + unsigned long addr = page_to_phys(sg_page(s)) +
> > s->offset;
>
> Umm. May I suggest (I haven't read the whole thread yet, maybe
> somebody else already did) that
>
> static inline unsigned long sg_phys(struct scatterlist *sg)
> {
> return page_to_phys(sg_page(sg)) + sg->offset;
> }
>
> would be a good thing to have?
>
> 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
.... but will that work for systems with IOMMU ? or is it fundamentally
the wrong interface
-
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