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

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Date:	Sat, 21 Oct 2006 11:29:14 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	David Miller <davem@...emloft.net>, nickpiggin@...oo.com.au,
	akpm@...l.org, linux-kernel@...r.kernel.org, anemo@....ocn.ne.jp,
	linux-arch@...r.kernel.org, schwidefsky@...ibm.com,
	James.Bottomley@...elEye.com
Subject: Re: [PATCH 1/3] Fix COW D-cache aliasing on fork

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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