Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755535AbaGVPEZ (ORCPT ); Tue, 22 Jul 2014 11:04:25 -0400 Received: from smtprelay03.ispgateway.de ([80.67.31.30]:43575 "EHLO smtprelay03.ispgateway.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752751AbaGVPEY (ORCPT ); Tue, 22 Jul 2014 11:04:24 -0400 References: <1398561815-22033-1-git-send-email-peter@piie.net> <1405817480-25347-1-git-send-email-peter@piie.net> <1405817480-25347-4-git-send-email-peter@piie.net> <20140721092950.GB10016@pd.tnic> <1405935627.2455.6.camel@rzhang1-toshiba> Message-ID: X-Mailer: http://www.courier-mta.org/cone/ From: Peter Feuerer To: Zhang Rui Cc: Borislav Petkov , LKML , Andrew Morton , Andreas Mohr , Borislav Petkov , Javi Merino Subject: Re: [PATCH v4 3/6] thermal: Added Bang-bang thermal governor Date: Tue, 22 Jul 2014 16:59:02 +0200 Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="US-ASCII" Content-Disposition: inline Content-Transfer-Encoding: 7bit X-Df-Sender: NDA0MDk0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Zhang Rui writes: > On Mon, 2014-07-21 at 11:29 +0200, Borislav Petkov wrote: >> On Sun, Jul 20, 2014 at 02:51:17AM +0200, Peter Feuerer wrote: >> > The bang-bang thermal governor uses a hysteresis to switch abruptly on >> > or off a cooling device. It is intended to control fans, which can >> > not be throttled but just switched on or off. >> > Bang-bang cannot be set as default governor as it is intended for >> > special devices only. For those special devices the driver needs to >> > explicitely request it. >> > >> > Cc: Andrew Morton >> > Cc: Zhang Rui >> > Cc: Andreas Mohr >> > Cc: Borislav Petkov >> > Cc: Javi Merino >> > Signed-off-by: Peter Feuerer >> > --- >> > drivers/thermal/Kconfig | 10 +++ >> > drivers/thermal/Makefile | 1 + >> > drivers/thermal/gov_bang_bang.c | 131 ++++++++++++++++++++++++++++++++++++++++ >> > drivers/thermal/thermal_core.c | 5 ++ >> > drivers/thermal/thermal_core.h | 8 +++ >> > 5 files changed, 155 insertions(+) >> > create mode 100644 drivers/thermal/gov_bang_bang.c >> > >> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig >> > index f9a1386..cdddf09 100644 >> > --- a/drivers/thermal/Kconfig >> > +++ b/drivers/thermal/Kconfig >> > @@ -84,6 +84,16 @@ config THERMAL_GOV_STEP_WISE >> > Enable this to manage platform thermals using a simple linear >> > governor. >> > >> > +config THERMAL_GOV_BANG_BANG >> > + bool "Bang Bang thermal governor" >> > + default y >> >> Right, this is problematic. >> >> When people are faced with the new selection after doing oldconfig, they >> can say yes or no. >> >> However, as acerhdf depends on it now, prompting the user to >> unconditionally says yes is kinda redundant. Especially as this governor >> is not supposed to be default anyway. >> >> Actually you don't need the Kconfig prompt at all as this is a sort-of >> "internal" governor and devices select it. IOW, it should be "default n" >> and ACERHDF will do "select THERMAL_GOV_BANG_BANG". Something like that >> at least. >> > I agree with this approach. Yes, you are right, this looks better. Then the "depend on THERMAL_GOV_BANG_BANG" could be removed from acerhdf Kbuild, as the "select" will take care acerhdf is compiled with THERMAL_GOV_BANG_BANG enabled, right? -- --peter; -- 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/