On Tue, 2005-08-09 at 23:15 +1000, Nick Piggin wrote:

I understand what you mean, and I agree. Though as far away from the
business end of the drivers I am, I tend to get the feeling that
drivers need the most hand holding.

they do. It's important to make driver APIs as fool proof as possible.

Anyway, I guess the way to understand the problem is finding the
reason why ioremap checks PageReserved, and whether or not ioremap
should be expected (or allowed) to remap physical RAM in use by
the kernel.

I can't think of ANY valid reason for that, in fact, it'll break a lot
due to cache aliases etc etc, on various cpus if not even on x86


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