Re: [Linux-ia64] patch to no longer use ia64's software mmu

[Andreas Schwab]

Arjan van de Ven <[e-mail]> writes:

|> Hi,
|> 
|> The patch below (against 2.4.16) makes the ia64 port no longer use the (VERY
|> slow) software IO mmu but makes it use the same mechanism the x86 PAE port
|> uses: it lets the higher layers take care of the proper bouncing of
|> PCI-unreachable memory. The implemenation is pretty simple; instead of
|> having a 4Gb GFP_DMA zone and a <rest of ram> GFP_KERNEL zone, the ia64 port
|> now has a 4Gb GFP_DMA zone and a <rest of ram> GFP_HIGH zone.
|> Since the ia64 cpu can address all of this memory directly, the kmap() and
|> related functions are basically nops. 

I tried it, but it doesn't compile: kmap_prot and kmap_pte are undefined.
If they are not used on ia64, then the reference in kernel/ksyms.c must be
removed.

Andreas.

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Andreas Schwab                                  "And now for something
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