linux-kernel - Re: [PATCH 1/24] make atomic_read() behave consistently on alpha

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Message-Id: <E1IJPkg-0000x0-00@gondolin.me.apana.org.au>
Date:	Fri, 10 Aug 2007 16:21:46 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	paulmck@...ux.vnet.ibm.com
Cc:	csnook@...hat.com, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, torvalds@...ux-foundation.org,
	netdev@...r.kernel.org, akpm@...ux-foundation.org, ak@...e.de,
	heiko.carstens@...ibm.com, 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
Subject: Re: [PATCH 1/24] make atomic_read() behave consistently on alpha

Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
>
> The compiler is within its rights to read a 32-bit quantity 16 bits at
> at time, even on a 32-bit machine.  I would be glad to help pummel any
> compiler writer that pulls such a dirty trick, but the C standard really
> does permit this.

Code all over the kernel assumes that 32-bit reads/writes
are atomic so while such a compiler might be legal it certainly
can't compile Linux.

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/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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