From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753741AbbGXGaG (ORCPT ); Fri, 24 Jul 2015 02:30:06 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:55472 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751849AbbGXGaD (ORCPT ); Fri, 24 Jul 2015 02:30:03 -0400 Date: Fri, 24 Jul 2015 08:29:48 +0200 From: Sascha Hauer To: Pavel Machek Cc: linux-pm@vger.kernel.org, Zhang Rui , Eduardo Valentin , linux-kernel@vger.kernel.org, Punit Agrawal , Jean Delvare , Peter Feuerer , Heiko Stuebner , Lukasz Majewski , Stephen Warren , Thierry Reding , linux-acpi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Guenter Roeck , "Rafael J. Wysocki" , Maxime Ripard , Darren Hart , lm-sensors@lm-sensors.org Subject: Re: [PATCH v2] thermal: consistently use int for temperatures Message-ID: <20150724062948.GK18700@pengutronix.de> References: <1437463292-24844-1-git-send-email-s.hauer@pengutronix.de> <20150723120759.GA17690@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20150723120759.GA17690@amd> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 08:13:20 up 29 days, 34 min, 44 users, load average: 0.05, 0.22, 0.35 User-Agent: Mutt/1.5.21 (2010-09-15) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c0 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 23, 2015 at 02:07:59PM +0200, Pavel Machek wrote: > On Tue 2015-07-21 09:21:32, Sascha Hauer wrote: > > The thermal code uses int, long and unsigned long for temperatures > > in different places. > > > > Using an unsigned type limits the thermal framework to positive > > temperatures without need. Also several drivers currently will report > > temperatures near UINT_MAX for temperatures below 0°C. This will probably > > immediately shut the machine down due to overtemperature if started below > > 0°C. > > > > 'long' is 64bit on several architectures. This is not needed since INT_MAX °mC > > is above the melting point of all known materials. > > Can we do something like > > typedef millicelsius_t int; > > ...to document the units? I am not very fond of typedefs and I am not sure this adds any value. I could change it when more people ask for it, but I just sent the new version without this. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |