From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: change definition of cpu_relax() for ARM11MPCore
Date: Mon, 12 Apr 2010 18:32:47 +0100 [thread overview]
Message-ID: <20100412173247.GA3048@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1271093038-31773-1-git-send-email-will.deacon@arm.com>
On Mon, Apr 12, 2010 at 06:23:58PM +0100, Will Deacon wrote:
> This patch changes the definition of cpu_relax() to smp_mb() for ARMv6 cores,
> forcing the write buffer to drain while inside a polling loop on an SMP system.
> If the Kernel is not compiled for SMP support, this will expand to a barrier()
> as before.
Linus asked how expensive (in terms of power rather than performance)
this was; so far that question has remained unanswered. Can someone
please answer his question?
next prev parent reply other threads:[~2010-04-12 17:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-12 17:23 [PATCH] ARM: change definition of cpu_relax() for ARM11MPCore Will Deacon
2010-04-12 17:32 ` Russell King - ARM Linux [this message]
2010-04-15 17:36 ` [Kgdb-bugreport] " George G. Davis
2010-04-15 21:03 ` Jamie Lokier
2010-04-16 13:54 ` Will Deacon
2010-04-19 14:39 ` Will Deacon
-- strict thread matches above, loose matches on Subject: below --
2010-05-27 15:11 Will Deacon
2010-05-27 15:20 ` Shilimkar, Santosh
2010-05-27 16:53 ` Will Deacon
2010-05-28 4:33 ` Shilimkar, Santosh
2010-03-09 16:06 Will Deacon
2010-03-09 16:22 ` Russell King - ARM Linux
2010-03-09 16:35 ` Will Deacon
2010-03-09 16:49 ` Russell King - ARM Linux
2010-03-09 17:59 ` Will Deacon
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