From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: LDREX/STREX and pre-emption on SMP hardware
Date: Mon, 14 Sep 2009 15:21:48 +0100 [thread overview]
Message-ID: <20090914142148.GE21580@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20090914140908.GD21580@n2100.arm.linux.org.uk>
On Mon, Sep 14, 2009 at 03:09:09PM +0100, Russell King - ARM Linux wrote:
> On Mon, Sep 14, 2009 at 01:21:21PM +0100, Catalin Marinas wrote:
> > And here's an untested patch to clear the exclusive monitor on the
> > exception return path. If you are OK with the idea, I'll do some testing
> > before pushing it for upstream:
>
> However, a plain STR is not guaranteed to change the state of the
> exclusive monitor - it is implementation defined whether STR does
> or not.
>
> This is true for both the local and global exclusive monitors.
... only for the same local CPU. A STR done by another CPU to the
address being monitored clears the global monitor.
next prev parent reply other threads:[~2009-09-14 14:21 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-21 15:07 LDREX/STREX and pre-emption on SMP hardware Richard Crewe
2009-08-21 15:42 ` Catalin Marinas
2009-08-21 15:50 ` Jamie Lokier
2009-08-21 15:58 ` Catalin Marinas
2009-08-21 21:29 ` David Xiao
2009-08-24 15:44 ` Catalin Marinas
2009-08-24 17:14 ` David Xiao
2009-08-24 17:41 ` Catalin Marinas
2009-08-24 18:59 ` David Xiao
2009-09-14 1:43 ` Jamie Lokier
2009-09-14 8:53 ` Catalin Marinas
2009-09-14 10:00 ` Russell King - ARM Linux
2009-09-14 10:06 ` Catalin Marinas
2009-09-14 11:47 ` Catalin Marinas
2009-09-14 12:21 ` Catalin Marinas
2009-09-14 12:43 ` Bill Gatliff
2009-09-14 12:57 ` Catalin Marinas
2009-09-14 19:30 ` Bill Gatliff
2009-09-14 14:09 ` Russell King - ARM Linux
2009-09-14 14:21 ` Russell King - ARM Linux [this message]
2009-09-14 14:26 ` Catalin Marinas
2009-09-14 15:35 ` Catalin Marinas
2009-09-14 23:16 ` Jamie Lokier
2009-09-14 14:23 ` Russell King - ARM Linux
2009-09-14 14:29 ` Catalin Marinas
2009-09-18 20:20 ` Russell King - ARM Linux
2009-09-18 22:51 ` Catalin Marinas
2009-08-24 21:12 ` Jamie Lokier
2009-08-25 8:33 ` Catalin Marinas
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