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SubjectRe: pre2.0.31-2
> 1) Suboptimal code cause by the over generality of the interface which
> does handle all cases by some clean interface.

Im unconvinced.

How about

writeback_cache_to_bus(void *low, int length,int flags)
flush_cache_of_bus(void *low, int length,int flags)

and adding the vremap_nocache option.

On a PC the routines do nothing, on other boxes they can do the work. Sort
of the way half the MMU hooks are null inlines on a PC, but exist to cope
with more annoying MMU's like the Sparc

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