From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx2.suse.de ([195.135.220.15]:55884 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752670AbcDSHtj (ORCPT ); Tue, 19 Apr 2016 03:49:39 -0400 Message-ID: <1461051988.15527.6.camel@suse.com> Subject: Re: [PATCH v2] watchdog: add driver for StreamLabs USB watchdog device From: Oliver Neukum To: Guenter Roeck Cc: Alexey Klimov , yury.norov@gmail.com, wim@iguana.be, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-watchdog@vger.kernel.org Date: Tue, 19 Apr 2016 09:46:28 +0200 In-Reply-To: <20160418163918.GE29343@roeck-us.net> References: <1460948016-5453-1-git-send-email-klimov.linux@gmail.com> <1460968368.25119.7.camel@suse.com> <5714E7D3.4030809@roeck-us.net> <1460988518.25119.28.camel@suse.com> <20160418163918.GE29343@roeck-us.net> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-watchdog-owner@vger.kernel.org List-Id: linux-watchdog@vger.kernel.org On Mon, 2016-04-18 at 09:39 -0700, Guenter Roeck wrote: > > Possibly. We have never gone that route. The obvious problems is > that > > I am not sure our alignment is known before boot. > > > Seems scary. I always thought that the alignment associated with > ____cacheline_aligned would be the maximum possible for a given > build/architecture. If not, what is the value of having > ____cacheline_aligned in the first place ? I thought it was for performance to prevent cache bouncing. I honestly don't know. You'd have to ask a specific question on LKML. Sorry Oliver