From: Andi Kleen <ak@suse.de>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: paulmck@linux.vnet.ibm.com, csnook@redhat.com,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
torvalds@linux-foundation.org, netdev@vger.kernel.org,
akpm@linux-foundation.org, heiko.carstens@de.ibm.com,
davem@davemloft.net, schwidefsky@de.ibm.com,
wensong@linux-vs.org, horms@verge.net.au, wjiang@resilience.com,
cfriesen@nortel.com, zlynx@acm.org, rpjday@mindspring.com,
jesper.juhl@gmail.com
Subject: Re: [PATCH 1/24] make atomic_read() behave consistently on alpha
Date: Fri, 10 Aug 2007 11:08:20 +0200 [thread overview]
Message-ID: <200708101108.20897.ak@suse.de> (raw)
In-Reply-To: <E1IJPkg-0000x0-00@gondolin.me.apana.org.au>
On Friday 10 August 2007 10:21:46 Herbert Xu wrote:
> Paul E. McKenney <paulmck@linux.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.
Yes, the kernel requirements are much stricter than ISO-C. And besides
it is a heavy user of C extensions anyways. On the other hand some of the
C99 extensions are not allowed. And then there is sparse, which enforces
a language which sometimes is quite far from standard C. You could say it is
written in Linux-C, not ISO C.
-Andi
next prev parent reply other threads:[~2007-08-10 9:08 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-09 13:24 [PATCH 1/24] make atomic_read() behave consistently on alpha Chris Snook
2007-08-09 14:32 ` Paul E. McKenney
2007-08-09 14:53 ` Chris Snook
2007-08-09 15:04 ` Paul E. McKenney
2007-08-09 15:24 ` Chris Snook
2007-08-09 15:50 ` Segher Boessenkool
2007-08-09 16:20 ` Chris Snook
2007-08-09 18:38 ` Segher Boessenkool
2007-08-09 19:05 ` Chris Snook
2007-08-09 19:19 ` Segher Boessenkool
2007-08-09 19:25 ` Geert Uytterhoeven
2007-08-09 19:47 ` Chris Snook
2007-08-09 23:02 ` Segher Boessenkool
2007-08-09 16:10 ` Paul E. McKenney
2007-08-09 16:36 ` Chris Snook
2007-08-09 16:58 ` Paul E. McKenney
2007-08-09 17:14 ` Chris Snook
2007-08-09 17:41 ` Paul E. McKenney
2007-08-09 18:13 ` Chris Snook
2007-08-09 18:45 ` Paul E. McKenney
2007-08-09 19:24 ` Chris Snook
2007-08-10 1:28 ` Paul E. McKenney
2007-08-10 19:49 ` Chris Snook
2007-08-10 20:26 ` Paul E. McKenney
2007-08-09 19:17 ` Segher Boessenkool
2007-08-09 18:51 ` Segher Boessenkool
2007-08-09 19:30 ` Chris Snook
2007-08-10 8:21 ` Herbert Xu
2007-08-10 9:08 ` Andi Kleen [this message]
2007-08-10 15:02 ` Paul E. McKenney
2007-08-10 20:07 ` Segher Boessenkool
2007-08-11 0:00 ` Herbert Xu
2007-08-11 0:38 ` Segher Boessenkool
2007-08-11 0:43 ` Herbert Xu
2007-08-11 0:50 ` Segher Boessenkool
2007-08-11 4:38 ` Valdis.Kletnieks
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