From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965109AbdEONrQ convert rfc822-to-8bit (ORCPT ); Mon, 15 May 2017 09:47:16 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:34343 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964984AbdEONrO (ORCPT ); Mon, 15 May 2017 09:47:14 -0400 Date: Mon, 15 May 2017 15:47:06 +0200 From: Sebastian Andrzej Siewior To: Fawad Lateef Cc: GuJiangfei , Linux Kernel Mailing List , kernelnewbies , linux-rt-users@vger.kernel.org Subject: Re: Question regarding RT patches for ARM Message-ID: <20170515134706.wughblmko3d7ouvi@linutronix.de> References: <3aa42082.b247.15c0c29ca5e.Coremail.qiledexin@163.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: User-Agent: NeoMutt/20170306 (1.8.0) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2017-05-15 15:09:45 [+0200], Fawad Lateef wrote: > Hi, > > I am talking in general about RT patches. Like downloaded 4.9.20 from > kernel.org and applied patch "4.9.20-rt16.patch". understood > On 15 May 2017 at 14:51, GuJiangfei wrote: > > Which rt patch do you mean? > > > > > > 发自网易邮箱大师 > > On 05/15/2017 20:44, Fawad Lateef wrote: > > > > Hi All, > > > > I am working on custom i.MX6 quad hardware and using RT patches for > > almost latest stable kernel 4.9 and facing some weird system stall OR > > 'unhandled page fault - exceptions'. and you are sure that this problems are caused by the RT patch or is there a chance that this is unrelated to the RT patch? > > Just want to confirm that "are RT patches for ARM are stable OR they > > are still experimental?" As I heard from my other colleagues that RT > > patches are not stable for ARM and should be avoided. It is stable and I am not aware of any ARM / IMX specific problems. Since this got here from kernelnewbies: I would not recommend the Preempt-RT patch set to add to any kernel just to have fancy patches. People use it because they need to fulfill specific requirements which would not work without it. You might want to check some of the documentation in the RT-wiki https://wiki.linuxfoundation.org/realtime/documentation/start > > Thanks in advance, > > > > -- Fawad Lateef Sebastian From mboxrd@z Thu Jan 1 00:00:00 1970 From: sebastian.siewior@linutronix.de (Sebastian Andrzej Siewior) Date: Mon, 15 May 2017 15:47:06 +0200 Subject: Question regarding RT patches for ARM In-Reply-To: References: <3aa42082.b247.15c0c29ca5e.Coremail.qiledexin@163.com> Message-ID: <20170515134706.wughblmko3d7ouvi@linutronix.de> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On 2017-05-15 15:09:45 [+0200], Fawad Lateef wrote: > Hi, > > I am talking in general about RT patches. Like downloaded 4.9.20 from > kernel.org and applied patch "4.9.20-rt16.patch". understood > On 15 May 2017 at 14:51, GuJiangfei wrote: > > Which rt patch do you mean? > > > > > > ???????? > > On 05/15/2017 20:44, Fawad Lateef wrote: > > > > Hi All, > > > > I am working on custom i.MX6 quad hardware and using RT patches for > > almost latest stable kernel 4.9 and facing some weird system stall OR > > 'unhandled page fault - exceptions'. and you are sure that this problems are caused by the RT patch or is there a chance that this is unrelated to the RT patch? > > Just want to confirm that "are RT patches for ARM are stable OR they > > are still experimental?" As I heard from my other colleagues that RT > > patches are not stable for ARM and should be avoided. It is stable and I am not aware of any ARM / IMX specific problems. Since this got here from kernelnewbies: I would not recommend the Preempt-RT patch set to add to any kernel just to have fancy patches. People use it because they need to fulfill specific requirements which would not work without it. You might want to check some of the documentation in the RT-wiki https://wiki.linuxfoundation.org/realtime/documentation/start > > Thanks in advance, > > > > -- Fawad Lateef Sebastian