From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1521CC43613 for ; Mon, 24 Jun 2019 10:58:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7D8D20820 for ; Mon, 24 Jun 2019 10:58:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729508AbfFXK6Y (ORCPT ); Mon, 24 Jun 2019 06:58:24 -0400 Received: from gecko.sbs.de ([194.138.37.40]:42687 "EHLO gecko.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727730AbfFXK6Y (ORCPT ); Mon, 24 Jun 2019 06:58:24 -0400 Received: from mail2.sbs.de (mail2.sbs.de [192.129.41.66]) by gecko.sbs.de (8.15.2/8.15.2) with ESMTPS id x5OAw6vg021376 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 24 Jun 2019 12:58:06 +0200 Received: from [139.25.68.37] (md1q0hnc.ad001.siemens.net [139.25.68.37] (may be forged)) by mail2.sbs.de (8.15.2/8.15.2) with ESMTP id x5OAw5ja021035; Mon, 24 Jun 2019 12:58:05 +0200 Subject: Re: PREEMPT_RT_FULL on x86-32 machine To: Pavel Machek Cc: linux-rt-users@vger.kernel.org, kernel list , mwhitehe@redhat.com References: <20190622081954.GA10751@amd> <2804bc5b-18c1-2793-171c-045c0725a6a7@siemens.com> <20190624105340.GA21414@amd> From: Jan Kiszka Message-ID: <903a1932-c530-5c45-31ab-a3b4d61d48eb@siemens.com> Date: Mon, 24 Jun 2019 12:58:04 +0200 User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 MIME-Version: 1.0 In-Reply-To: <20190624105340.GA21414@amd> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 24.06.19 12:53, Pavel Machek wrote: > Hi! > >>> Is full preemption supposed to work on x86-32 machines? >>> >>> Because it does not work for me. It crashes early in boot, no messages >>> make it to console. Similar configuration for x86-64 boots ok. >>> >> >> Maybe you can also tell which version(s) you tried, and in which >> configuration(s), and how the crash looked like. > > I wanted to know if the configuration is supposed to work at all > before starting heavy debugging. From your reply I assume that it > should work. We still have at least one 4.4-based 32-bit-only target on RT. But there is likely more, even though I'm promoting to use at least a 64-bit kernel on 64-bit capable hw for many years, irrespective of RT. Jan > > I tried 4.19.13-rt1-cip1 among others. Crash is early in boot, I can > try some early printing... > > Best regards, > Pavel > -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux