linux-kernel - Re: Opinion on ordering of writel vs. stores to RAM

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Date:	Sat, 09 Sep 2006 16:09:51 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, akpm@...l.org,
	segher@...nel.crashing.org, davem@...emloft.net
Subject: Re: Opinion on ordering of writel vs. stores to RAM

Ar Sad, 2006-09-09 am 17:23 +1000, ysgrifennodd Benjamin Herrenschmidt:
> The problem is that very few people have any clear idea of what mmiowb
> is :) In fact, what you described is not the definition of mmiowb
> according to Jesse 

Some of us talked a little about this at Linux Kongress and one
suggestion so people did understand it was

	spin_lock_io();
	spin_unlock_io();

so that it can be expressed not as a weird barrier op but as part of the
locking.

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