Re: [PATCH 1/3] Fix COW D-cache aliasing on fork

[Paul Mackerras]

Linus Torvalds writes:

> I think (but may be mistaken) that ARM _does_ have pure virtual caches 
> with a process ID, but people have always ended up flushing them at 
> context switch simply because it just causes too much trouble.
> 
> Sparc? VIPT too? Davem?

There is one PowerPC embedded chip family, the PPC440, which has a
virtual i-cache with a process ID tag.  The d-cache is sane though.
Of course, the i-cache being readonly means we avoid the nastier
issues.

Paul.
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