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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT 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 5B9CCC4321D for ; Thu, 23 Aug 2018 18:43:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C90521566 for ; Thu, 23 Aug 2018 18:43:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1C90521566 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.vnet.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727552AbeHWWOh (ORCPT ); Thu, 23 Aug 2018 18:14:37 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:39678 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726985AbeHWWOh (ORCPT ); Thu, 23 Aug 2018 18:14:37 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w7NITGXS119942 for ; Thu, 23 Aug 2018 14:43:36 -0400 Received: from e17.ny.us.ibm.com (e17.ny.us.ibm.com [129.33.205.207]) by mx0b-001b2d01.pphosted.com with ESMTP id 2m1y1dhkc3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 23 Aug 2018 14:43:36 -0400 Received: from localhost by e17.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 23 Aug 2018 14:43:34 -0400 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w7NIhXPf28704842 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Aug 2018 18:43:33 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A2325B2067; Thu, 23 Aug 2018 14:42:37 -0400 (EDT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 84A6FB205F; Thu, 23 Aug 2018 14:42:37 -0400 (EDT) Received: from paulmck-ThinkPad-W541 (unknown [9.70.82.159]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 23 Aug 2018 14:42:37 -0400 (EDT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id A3C1B16C86E3; Thu, 23 Aug 2018 11:43:33 -0700 (PDT) Date: Thu, 23 Aug 2018 11:43:33 -0700 From: "Paul E. McKenney" To: Geert Uytterhoeven Cc: Nicolas Pitre , Josh Triplett , Linux Kernel Mailing List Subject: Re: Kernel-only deployments? Reply-To: paulmck@linux.vnet.ibm.com References: <20180823174359.GA13033@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 18082318-0040-0000-0000-0000046437DA X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009599; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01077799; UDB=6.00555724; IPR=6.00857773; MB=3.00022891; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-23 18:43:35 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082318-0041-0000-0000-0000086B4C1F Message-Id: <20180823184333.GR4225@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-23_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808230191 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 23, 2018 at 08:16:55PM +0200, Geert Uytterhoeven wrote: > Hi Paul, > > On Thu, Aug 23, 2018 at 7:44 PM Paul E. McKenney > wrote: > > Does anyone do kernel-only deployments, for example, setting up an > > embedded device having a Linux kernel and absolutely no userspace > > whatsoever? > > Isn't that basically the original porting guide from VxWorks to Linux? I haven't seen that document, but if you say so. The TimeSys appnote suggests using Linux userspace, but I can easily imagine cases where porting the VxWorks "application" into the Linux kernel. But do you really believe that supporting Linux-kernel-only deployments in mainline would be something worth doing? Who aside from rcutorture would really use such a thing? Thanx, Paul > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like that. > -- Linus Torvalds >