_IO_IS_ISA question

Benjamin Herrenschmidt benh at kernel.crashing.org
Fri Mar 26 09:36:36 EST 2004

> Dang, I could have sworn that the ppc64 macros didn't do that, but now
> that I really did look at them, I see that indeed they do, so objections
> withdrawn & I am feeling slightly foolish.
> Moving off-topic: anyone ever experiment with removing these isyncs
> from the ppc64 code, and seeing if at least our most common
> adapters/controllers still work?  Are these broken drivers for things
> that no one would ever plug into ppc64?

Why the heck would we want to take such a risk ? I just added them
actually ;) The cost of the twi/isync is, I beleive, small compared
to the overall cost of doing an IO read, and I'm not prepared to
go back to some "unsafe" situation just because the 3 1/2 adapters
used on pSeries are happy with it (and I'm sure they aren't anyway).

There is more to ppc64 than just pSeries anyway ;)


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