From: Greg Kroah-Hartman <greg@kroah.com>
To: Timur Tabi <timur@codeaurora.org>
Cc: peter@hurleysoftware.com, 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: Sat, 12 Dec 2015 22:04:59 -0800 [thread overview]
Message-ID: <20151213060459.GA30609@kroah.com> (raw)
In-Reply-To: <1446562867-5693-1-git-send-email-timur@codeaurora.org>
On Tue, Nov 03, 2015 at 09:01:06AM -0600, 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.
>
> Signed-off-by: Timur Tabi <timur@codeaurora.org>
> Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
> ---
> drivers/tty/serial/amba-pl011.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
Doesn't apply to my tree :(
WARNING: multiple messages have this Message-ID (diff)
From: greg@kroah.com (Greg Kroah-Hartman)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers
Date: Sat, 12 Dec 2015 22:04:59 -0800 [thread overview]
Message-ID: <20151213060459.GA30609@kroah.com> (raw)
In-Reply-To: <1446562867-5693-1-git-send-email-timur@codeaurora.org>
On Tue, Nov 03, 2015 at 09:01:06AM -0600, 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.
>
> Signed-off-by: Timur Tabi <timur@codeaurora.org>
> Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
> ---
> drivers/tty/serial/amba-pl011.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
Doesn't apply to my tree :(
next prev parent reply other threads:[~2015-12-13 6:04 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 ` [PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers Peter Hurley
2015-11-06 1:14 ` Peter Hurley
2015-12-13 6:04 ` Greg Kroah-Hartman [this message]
2015-12-13 6:04 ` Greg Kroah-Hartman
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