linux-kernel - Re: [PATCH 6/24] make atomic_read() behave consistently on frv

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Message-Id: <7131d547746a998fcec74d1c091f9f6a@kernel.crashing.org>
Date:	Wed, 15 Aug 2007 23:15:51 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	heiko.carstens@...ibm.com, horms@...ge.net.au,
	linux-kernel@...r.kernel.org, rpjday@...dspring.com, ak@...e.de,
	netdev@...r.kernel.org, cfriesen@...tel.com,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	linux-arch@...r.kernel.org, jesper.juhl@...il.com, zlynx@....org,
	schwidefsky@...ibm.com, Chris Snook <csnook@...hat.com>,
	davem@...emloft.net, wensong@...ux-vs.org, wjiang@...ilience.com,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 6/24] make atomic_read() behave consistently on frv

> Please check the definition of "cache coherence".

Which of the twelve thousand such definitions?  :-)

> Summary: the CPU is indeed within its rights to execute loads and 
> stores
> to a single variable out of order, -but- only if it gets the same 
> result
> that it would have obtained by executing them in order.  Which means 
> that
> any reordering of accesses by a single CPU to a single variable will be
> invisible to the software.

I'm still not sure if that applies to all architectures.
Doesn't matter anyway, let's kill this thread :-)


Segher

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