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

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Message-Id: <cddb9608159b27a528fe87e94193dd0b@kernel.crashing.org>
Date:	Thu, 16 Aug 2007 21:44:14 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Christoph Lameter <clameter@....com>, heiko.carstens@...ibm.com,
	horms@...ge.net.au, Stefan Richter <stefanr@...6.in-berlin.de>,
	Satyam Sharma <satyam@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, ak@...e.de, 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, Chris Snook <csnook@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	wensong@...ux-vs.org, wjiang@...ilience.com
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

> I'd go so far as to say that anywhere where you want a non-"volatile"
> atomic_read, either your code is buggy, or else an int would work just
> as well.

Even, the only way to implement a "non-volatile" atomic_read() is
essentially as a plain int (you can do some tricks so you cannot
assign to the result and stuff like that, but that's not the issue
here).

So if that would be the behaviour we wanted, just get rid of that
whole atomic_read() thing, so no one can misuse it anymore.


Segher

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