Messages in this thread | | | Date | Mon, 15 Dec 2003 23:53:38 -0500 | From | Jeff Garzik <> | Subject | Re: PCI Express support for 2.4 kernel |
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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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