Re: pte_pagenr/MAP_NR deleted in pre6

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

>    Whatever you do, you either have to introduce paddr_t (which to me
>    seems more intuitive) or page_to_pfn. We can argue one way or
>    another, but paddr_t might give you type checking for free too ...
> 
> My only two gripes about paddr_t is that long long is not only
> expensive but has been also known to be buggy on 32-bit platforms.

Except for the x86 36bit abortion do we need a long long paddr_t on any
32bit platform ?

> Which reminds me, we need to schedule a field day early 2.5.x where
> virt_to_bus and bus_to_virt are exterminated, this is the only way we
> can move to drivers using page+offset correctly, forcing them through
> interface such as the pci_dma API instead.

So you'll be adding an isa_alloc_consistant, mca_alloc_consistent, 
m68k_motherboard_alloc_consistent , ....

And then of course I need virt_to_bus/bus_to_virt to poke at things like
hardware on a PC and to access the roms.

Its not trivial to exterminate. It really isnt. The PCI api is a tiny subset
of uses for those functions.




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