Re: PCI Express support for 2.4 kernel

[Jeff Garzik]

Linus Torvalds wrote:
> On Mon, 15 Dec 2003, Jeff Garzik wrote:
> > neat.  dumb question though...  how portable is set_fixmap_nocache()?

> Not very. Although it should generally be trivial to port if you need it.
[...]
> On 64-bit architectures you're not likely to ever need to worry about it,
> and then you can just map the whole thing directly (and use some special
> large-page mapping for it, at that).

Yeah, good point.  IA64 with its 1001 different types of mappings and 
zones can go crazy, for example.

Sounds like PCI express needs a per-architecture policy for mapping the 
256MB region.  Some [64b] arches can direct-map the entire area.  IA32 
and others can go another route.

	Jeff



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