On Sat, Feb 12, 2000 at 03:41:23PM -0800, Linus Torvalds wrote:
> Richard, you do not seem to understand.
>
> The highmem approach gets everything right, and has basically zero
> performance impact.
Apparently not. Yes, I can see that some could be avoided by taking
care to allocate things properly, but I just can't see how you can get
away from doing any copies at all.
> "all devices converted" is not even _close_ to true. You'll end up with
> horrible configuration problems, where people don't even realize that one
> of the drivers (or perhaps a module) isn't necessarily safe.
If the kernel compiles without virt_to_bus, it's safe. Which
could be implied by the config option that enables >2GB.
r~
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