On Thu, 11 Nov 1999 13:47:04 +0100 (CET), Ingo Molnar
<mingo@chiara.csoma.elte.hu> said:
> nevertheless i disagree a little bit with the current situation :) i
> believe we should keep the kiobuf interface (towards lowlevel drivers)
> 'struct page *'-only, for simplicity. The PCI-to-PCI DMA case is
> definitely worth worrying about, but we should rather extend the 'struct
> page *' notion instead of putting in a dual interface. There are two
> solutions i can think of: we could as well keep a separate mem_map for PCI
> (and generic bus) areas, to control usage. This means page_to_physaddr()
> type of conversion gets one more branch - no problem i think.
That's possible, although it complicates things like MAP_NR
unnecessarily on architectures which have contiguous physical memory.
> the other solution is to allow 'struct page *' to overflow above
> mem_map[].
Yes, we can do this. Let me ponder it a bit more, this sounds like the
better answer.
--Stephen
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/