linux-kernel - Re: [PATCH v3] ARM: tegra: cpuidle: implement cpuidle_state.enter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAAObsKCURyo-ujcA7r+UYqSw6ie-aBxKiYEdTKwe-HrL14RkBw@mail.gmail.com>
Date:	Thu, 18 Jun 2015 09:09:29 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Ingo Molnar <mingo@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: tegra: cpuidle: implement cpuidle_state.enter_freeze()

On 21 May 2015 at 03:02, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Tuesday, May 19, 2015 04:49:12 PM Tomeu Vizoso wrote:
>> This callback is expected to do the same as enter() but it has to
>> guarantee that interrupts aren't enabled at any point in its execution,
>> as the tick is frozen.
>>
>> It will be called when the system goes to suspend-to-idle and will
>> reduce power usage because CPUs won't be awaken for unnecessary IRQs.
>>
>> By setting the CPUIDLE_FLAG_TIMER_STOP flag, we can reuse the same code
>> for both the enter() and enter_freeze() callbacks.
>>
>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Makes sense to me, but I suppose it should go in via arm-soc.

Hi Thierry,

what's the plan regarding merging of this patch?

It needs df8d9ee ("cpuidle: Run tick_broadcast_exit() with disabled
interrupts") so it doesn't break boot.

Thanks,

Tomeu
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/