From: Peter Hurley <peter@hurleysoftware.com>
To: Timur Tabi <timur@codeaurora.org>, Greg Kroah-Hartman <greg@kroah.com>
Cc: andre.przywara@arm.com, Linus Walleij <linus.walleij@linaro.org>,
Andrew.Jackson@arm.com, linux-serial@vger.kernel.org,
jslaby@suse.com, jun.nie@linaro.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers
Date: Thu, 5 Nov 2015 20:14:23 -0500 [thread overview]
Message-ID: <563BFEEF.3020709@hurleysoftware.com> (raw)
In-Reply-To: <1446562867-5693-1-git-send-email-timur@codeaurora.org>
On 11/03/2015 10:01 AM, Timur Tabi wrote:
> Busy loops that poll on a register should call cpu_relax(). On some
> architectures, it can lower CPU power consumption or yield to a
> hyperthreaded twin processor. It also serves as a compiler barrier,
> so it can replace barrier() calls.
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
WARNING: multiple messages have this Message-ID (diff)
From: peter@hurleysoftware.com (Peter Hurley)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers
Date: Thu, 5 Nov 2015 20:14:23 -0500 [thread overview]
Message-ID: <563BFEEF.3020709@hurleysoftware.com> (raw)
In-Reply-To: <1446562867-5693-1-git-send-email-timur@codeaurora.org>
On 11/03/2015 10:01 AM, Timur Tabi wrote:
> Busy loops that poll on a register should call cpu_relax(). On some
> architectures, it can lower CPU power consumption or yield to a
> hyperthreaded twin processor. It also serves as a compiler barrier,
> so it can replace barrier() calls.
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
next prev parent reply other threads:[~2015-11-06 1:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-03 15:01 [PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers Timur Tabi
2015-11-03 15:01 ` Timur Tabi
2015-11-03 15:01 ` [PATCH 2/2] serial: amba-pl011: abstract register accessors Timur Tabi
2015-11-03 15:01 ` Timur Tabi
2015-11-03 16:12 ` Russell King - ARM Linux
2015-11-03 16:12 ` Russell King - ARM Linux
2015-11-03 16:43 ` Timur Tabi
2015-11-03 16:43 ` Timur Tabi
2015-11-06 1:19 ` Peter Hurley
2015-11-06 1:19 ` Peter Hurley
2015-11-06 1:14 ` Peter Hurley [this message]
2015-11-06 1:14 ` [PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers Peter Hurley
2015-12-13 6:04 ` Greg Kroah-Hartman
2015-12-13 6:04 ` Greg Kroah-Hartman
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