Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754696AbbENAbh (ORCPT ); Wed, 13 May 2015 20:31:37 -0400 Received: from mail-pa0-f46.google.com ([209.85.220.46]:35852 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751663AbbENAbc (ORCPT ); Wed, 13 May 2015 20:31:32 -0400 From: Kevin Hilman To: "Rafael J. Wysocki" Cc: Daniel Lezcano , Preeti U Murthy , Peter Zijlstra , Thomas Gleixner , "Rafael J. Wysocki" , rlippert@google.com, "linux-pm\@vger.kernel.org" , Linus Walleij , lkml , Ingo Molnar , Sudeep Holla , linuxppc-dev@lists.ozlabs.org, Lina Iyer , Ulf Hansson Subject: Re: [PATCH 0/3] cpuidle: updates related to tick_broadcast_enter() failures References: <20150508073418.28491.4150.stgit@preeti.in.ibm.com> <1842725.60y5FMGEPh@vostro.rjw.lan> <3381363.cclTYyKPz9@vostro.rjw.lan> Date: Wed, 13 May 2015 17:31:28 -0700 In-Reply-To: <3381363.cclTYyKPz9@vostro.rjw.lan> (Rafael J. Wysocki's message of "Thu, 14 May 2015 02:42:11 +0200") Message-ID: <7h1tik2e5b.fsf@deeprootsystems.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1762 Lines: 41 "Rafael J. Wysocki" writes: > On Wednesday, May 13, 2015 05:13:27 PM Kevin Hilman wrote: >> On Wed, May 13, 2015 at 5:16 PM, Rafael J. Wysocki wrote: >> > On Wednesday, May 13, 2015 03:59:55 PM Kevin Hilman wrote: >> >> "Rafael J. Wysocki" writes: >> >> >> >> [...] >> >> >> >> > Second, quite honestly, I don't see a connection to genpd here. >> >> >> >> The connection with genpd is because the *reason* the timer was >> >> shutdown/stopped is because it shares power with the CPU, which is why >> >> the timer stops when the CPU hits ceratin low power states. IOW, it's >> >> in the same power domain as the CPU. >> > >> > Well, what if you don't have genpd on that system? Is the problem at hand not >> > relevant then magically? >> >> Well, if you're not using genpd to model hardware power domain >> dependencies, then yes you'll definitely need a different solution. >> >> And, as we discussed on IRC. If you only care about timers, and genpd >> is not in use, then $SUBJECT series is a fine approach, and I have no >> objections. But for SoCs where there are several other things that >> share power with CPU, we need a more generic, genpd based solution, >> which it seems we're in agreement on. And since the two approaches >> are not mutually exclusive, then I have real objections to applying >> this series. > > I guess a "no" is missing in the last sentence. ;-) Correct. I have *no* real objections to applying this series. Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/