linux-kernel - Re: [patch] mm: fix anon

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Message-ID: <18681.48931.493345.839251@cargo.ozlabs.ibm.com>
Date:	Sat, 18 Oct 2008 21:49:07 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Hugh Dickins <hugh@...itas.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org
Subject: Re: [patch] mm: fix anon_vma races

Nick Piggin writes:

> > Not sure what you mean by causal consistency, but I assume it's the
> 
> I think it can be called transitive. Basically (assumememory starts off zeroed)
> CPU0
> x := 1
> 
> CPU1
> if (x == 1) {
>   fence
>   y := 1
> }
> 
> CPU2
> if (y == 1) {
>   fence
>   assert(x == 1)
> }

That's essentially the same as example 1 on page 415, so yes we are
talking about the same thing.

Paul.
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