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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html