linux-kernel - Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

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Message-Id: <f95b4ab810e3850f92ee7e98a1219bb2@kernel.crashing.org>
Date:	Tue, 21 Aug 2007 00:07:15 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Chris Snook <csnook@...hat.com>
Cc:	Christoph Lameter <clameter@....com>,
	Paul Mackerras <paulus@...ba.org>, heiko.carstens@...ibm.com,
	Stefan Richter <stefanr@...6.in-berlin.de>, horms@...ge.net.au,
	Satyam Sharma <satyam@...radead.org>,
	Ilpo Jarvinen <ilpo.jarvinen@...sinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, ak@...e.de,
	Netdev <netdev@...r.kernel.org>, cfriesen@...tel.com,
	rpjday@...dspring.com, jesper.juhl@...il.com,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, zlynx@....org,
	schwidefsky@...ibm.com, Herbert Xu <herbert.xu@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	wensong@...ux-vs.org, Nick Piggin <piggin@...erone.com.au>,
	wjiang@...ilience.com
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

> Such code generally doesn't care precisely when it gets the update, 
> just that the update is atomic, and it doesn't loop forever.

Yes, it _does_ care that it gets the update _at all_, and preferably
as early as possible.

> Regardless, I'm convinced we just need to do it all in assembly.

So do you want "volatile asm" or "plain asm", for atomic_read()?
The asm version has two ways to go about it too...


Segher

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