From: Chuck Ebbert <cebbert@redhat.com>
To: Chris Snook <csnook@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
akpm@linux-foundation.org, ak@suse.de, heiko.carstens@de.ibm.com,
davem@davemloft.net, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, schwidefsky@de.ibm.com,
wensong@linux-vs.org, horms@verge.net.au, wjiang@resilience.com,
cfriesen@nortel.com, zlynx@acm.org
Subject: Re: [PATCH] make atomic_t volatile on all architectures
Date: Thu, 09 Aug 2007 13:36:11 -0400 [thread overview]
Message-ID: <46BB508B.7050601@redhat.com> (raw)
In-Reply-To: <46BAC2BE.1090106@redhat.com>
On 08/09/2007 03:31 AM, Chris Snook wrote:
>
> Fair enough. Casting to (volatile int *) will give us the behavior
> people expect when using atomic_t without needing to use inefficient
> barriers.
>
You can use this forget() macro to make the compiler reread a variable:
#define forget(var) asm volatile ("" : "=m"(var))
next prev parent reply other threads:[~2007-08-09 17:42 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-08 23:07 [PATCH] make atomic_t volatile on all architectures Chris Snook
2007-08-08 23:18 ` Jesper Juhl
2007-08-08 23:31 ` Chris Snook
2007-08-08 23:51 ` Jesper Juhl
2007-08-08 23:25 ` Lennert Buytenhek
2007-08-08 23:35 ` Chris Snook
2007-08-09 1:03 ` Herbert Xu
2007-08-09 1:48 ` David Miller
2007-08-09 3:47 ` Paul E. McKenney
2007-08-09 7:47 ` Chris Snook
2007-08-09 8:30 ` Herbert Xu
2007-08-09 11:44 ` Chris Snook
2007-08-09 4:18 ` Linus Torvalds
2007-08-09 4:59 ` Jerry Jiang
2007-08-09 7:31 ` Chris Snook
2007-08-09 8:14 ` Heiko Carstens
2007-08-09 17:36 ` Chuck Ebbert [this message]
2007-08-09 17:55 ` Linus Torvalds
2007-08-09 18:20 ` Martin Schwidefsky
2007-08-12 5:53 ` Segher Boessenkool
2007-08-12 6:09 ` Linus Torvalds
2007-08-12 9:48 ` Martin Schwidefsky
2007-08-12 9:54 ` Linus Torvalds
2007-08-12 16:30 ` Segher Boessenkool
2007-08-12 18:11 ` Linus Torvalds
2007-08-12 19:13 ` Segher Boessenkool
2007-08-12 10:27 ` Segher Boessenkool
2007-08-12 17:59 ` Linus Torvalds
2007-08-12 9:47 ` Martin Schwidefsky
2007-08-12 10:35 ` Segher Boessenkool
2007-08-09 17:57 ` Martin Schwidefsky
[not found] <8Q2Pg-8uV-23@gated-at.bofh.it>
[not found] ` <8Q7Fa-7rJ-1@gated-at.bofh.it>
[not found] ` <8Q8rD-hh-7@gated-at.bofh.it>
2007-08-09 9:10 ` Bodo Eggert
2007-08-09 9:10 ` Bodo Eggert
2007-08-09 9:18 ` Jerry Jiang
2007-08-09 15:00 ` Linus Torvalds
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