Re: per_cpu fixes

[Linus Torvalds]

On Thu, 10 Jul 2003, David Mosberger wrote:
> 
> You mean there would be three primitives:
> 
>  (1) get value from a per-CPU variable
>  (2) set value of a per-CPU variable
>  (3) get the (canonical) address of a per-CPU variable

Argh.

We'd better have the rule that if there are any virtual caches or other
issues, then the "canonical address" had better be the _only_ address (or
at least any virtual remapping has to be done in such a way that it never
causes aliasing or other performance problems with the canonical address).

This is already turning fairly ugly, and I just don't want to see even 
more ugly rules like "you can't mix direct accesses with pointer accesses"

		Linus