From: Jeremy Fitzhardinge <jeremy@goop.org>
To: David Rientjes <rientjes@google.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Paul Sokolovsky <pmiscml@gmail.com>,
linux-kernel@vger.kernel.org, Andi Kleen <ak@suse.de>
Subject: Re: [RFC/PATCH] doc: volatile considered evil
Date: Tue, 08 May 2007 15:29:24 -0700 [thread overview]
Message-ID: <4640F9C4.8050804@goop.org> (raw)
In-Reply-To: <alpine.DEB.0.99.0705081510370.25865@chino.kir.corp.google.com>
David Rientjes wrote:
> It is analogous with a sequence point for ia64. But, as you mentioned, it
> is ia64 specific so your comment about "asm volatile" constructs not being
> reordered is always appropriate outside of ia64 specific code but may not
> apply to ia64 if we ever compiled with -mvolatile-asm-stop. If we do not
> compile with that option, the behavior is unspecified. I don't think
> we'll be adding -mvolatile-asm-stop support any time soon so your warning
> certainly is appropriate for all code at this time.
>
Sounds like it's referring to micro-architectural reordering, which is
distinct from compiler reordering. In other words, even if you
specified "-mvolatile-asm-stop" I would assume that the compiler could
still reorder the asm statements. Am I right, or should I read more
into the manual description than it actually says?
J
next prev parent reply other threads:[~2007-05-08 22:29 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-01 5:08 [RFC, PATCH 2/4] SoC base drivers: ASIC3 SoC hardware definitions Paul Sokolovsky
2007-05-01 6:56 ` Andrew Morton
2007-05-01 10:27 ` Alan Cox
2007-05-01 12:04 ` Paul Sokolovsky
2007-05-01 12:21 ` Jamey Hicks
2007-05-08 19:14 ` [RFC/PATCH] doc: volatile considered evil Randy Dunlap
2007-05-08 19:18 ` David Rientjes
2007-05-08 20:00 ` Krzysztof Halasa
2007-05-08 20:20 ` David Rientjes
2007-05-08 23:13 ` Randy Dunlap
2007-05-08 23:54 ` David Rientjes
2007-05-09 0:00 ` Randy Dunlap
2007-05-08 21:05 ` Jeremy Fitzhardinge
2007-05-08 21:10 ` Krzysztof Halasa
2007-05-08 21:16 ` Jeff Garzik
2007-05-08 21:26 ` Randy Dunlap
2007-05-08 21:25 ` Jeff Garzik
2007-05-08 21:20 ` Jeremy Fitzhardinge
2007-05-08 21:27 ` David Rientjes
2007-05-08 21:37 ` Jeremy Fitzhardinge
2007-05-08 21:59 ` David Rientjes
2007-05-08 22:04 ` Jeremy Fitzhardinge
2007-05-08 22:19 ` David Rientjes
2007-05-08 22:29 ` Jeremy Fitzhardinge [this message]
2007-05-08 22:35 ` David Rientjes
2007-05-08 23:09 ` Randy Dunlap
2007-05-08 21:29 ` Randy Dunlap
2007-05-08 20:07 ` Satyam Sharma
2007-05-08 23:34 ` [PATCH] " Randy Dunlap
2007-05-09 0:06 ` David Rientjes
2007-05-09 2:08 ` Randy Dunlap
2007-05-09 2:38 ` David Rientjes
2007-05-09 3:15 ` Randy Dunlap
2007-05-09 9:21 ` Alan Cox
2007-05-09 9:26 ` Nick Piggin
2007-05-09 13:31 ` Alan Cox
2007-05-09 10:25 ` David Rientjes
2007-05-09 13:36 ` Alan Cox
2007-05-09 18:41 ` David Rientjes
2007-05-09 20:23 ` Alan Cox
2007-05-09 20:25 ` David Rientjes
2007-05-09 22:47 ` Rob Landley
2007-05-09 8:50 ` Stefan Richter
2007-05-09 15:52 ` Randy Dunlap
2007-05-09 19:04 ` Satyam Sharma
2007-05-09 1:47 ` [RFC/PATCH] " Jonathan Corbet
2007-05-09 9:43 ` Johannes Stezenbach
2007-05-09 19:34 ` Satyam Sharma
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