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

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Message-ID: <20070910111555.GA27221@gondor.apana.org.au>
Date:	Mon, 10 Sep 2007 19:15:55 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <piggin@...erone.com.au>,
	Satyam Sharma <satyam@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Christoph Lameter <clameter@....com>,
	Chris Snook <csnook@...hat.com>,
	Ilpo Jarvinen <ilpo.jarvinen@...sinki.fi>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, Netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, ak@...e.de,
	heiko.carstens@...ibm.com, David Miller <davem@...emloft.net>,
	schwidefsky@...ibm.com, wensong@...ux-vs.org, horms@...ge.net.au,
	wjiang@...ilience.com, cfriesen@...tel.com, zlynx@....org,
	rpjday@...dspring.com, jesper.juhl@...il.com,
	segher@...nel.crashing.org
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

On Mon, Sep 10, 2007 at 11:56:29AM +0100, Denys Vlasenko wrote:
> 
> Expecting every driver writer to remember that atomic_read is not in fact
> a "read from memory" is naive. That won't happen. Face it, majority of
> driver authors are a bit less talented than Ingo Molnar or Arjan van de Ven ;)
> The name of the macro is saying that it's a read.
> We are confusing users here.

For driver authors who're too busy to learn the intricacies
of atomic operations, we have the plain old spin lock which
then lets you use normal data structures such as u32 safely.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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