From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751336AbcGMU0V (ORCPT ); Wed, 13 Jul 2016 16:26:21 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:50806 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751142AbcGMU0P (ORCPT ); Wed, 13 Jul 2016 16:26:15 -0400 Date: Wed, 13 Jul 2016 22:26:11 +0200 From: Pavel Machek To: "Rafael J. Wysocki" Cc: Chen Yu , Linux PM , "Rafael J. Wysocki" , Len Brown , Linux Kernel Mailing List Subject: Re: [PATCH] PM / hibernate: Introduce snapshot test mode for hibernation Message-ID: <20160713202611.GA32111@amd> References: <1467873658-31986-1-git-send-email-yu.c.chen@intel.com> <20160713095005.GA27870@amd> <578615D5.3060501@intel.com> <20160713102156.GA14505@atrey.karlin.mff.cuni.cz> <57861A70.9090606@intel.com> <20160713170123.GA13546@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 2016-07-13 22:04:27, Rafael J. Wysocki wrote: > On Wed, Jul 13, 2016 at 7:01 PM, Pavel Machek wrote: > > Hi! > > > >> >>and then swapon the swap device, and do a testing. This should be safer? > >> >Yeah, that's the way. Read-only root is other option. > >> > > >> >>>I guess updating documentation would be welcome from my side, > >> >>>otherwise it should be ok. > >> >>OK, I'll update the documents. > >> >Just add fat warning into the documentation. > >> OK. > > > > Actually... If you could add > > > > printk(KERN_ALERT "Hibernation image written. If you have any > > filesystems mounted read-write and attempt to resume, you'll corrupt > > your data. To prevent that, remove the hibernation image.\n") > > > > ...I guess that would save someone's filesystem. (Yes, very high > > loglevel. If you attempt to do this from anything else then singleuser > > or initrd, you are asking for problems, so... lets make sure user sees > > it.) > > Please see the new version of this patch: > https://patchwork.kernel.org/patch/9226837/ New version changes nothing, right? You still need to be sure filesystems are not mounted r/w. So I would still like to see printk() with warning. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html