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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_NEOMUTT 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 9ED80C5CFE7 for ; Wed, 11 Jul 2018 07:23:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 61AA020846 for ; Wed, 11 Jul 2018 07:23:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 61AA020846 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de 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 S1727019AbeGKH0F (ORCPT ); Wed, 11 Jul 2018 03:26:05 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:38978 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726444AbeGKH0F (ORCPT ); Wed, 11 Jul 2018 03:26:05 -0400 Received: from bigeasy by Galois.linutronix.de with local (Exim 4.80) (envelope-from ) id 1fd9Sx-0006c1-N2; Wed, 11 Jul 2018 09:23:11 +0200 Date: Wed, 11 Jul 2018 09:23:11 +0200 From: Sebastian Andrzej Siewior To: Steven Rostedt Cc: Thomas Gleixner , linux-rt-users , LKML Subject: Re: Why the mce reverts in 4.16-rt? Message-ID: <20180711072311.cprdgb2xqwag2iem@linutronix.de> References: <20180710205624.19ff9ef0@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20180710205624.19ff9ef0@gandalf.local.home> User-Agent: NeoMutt/20180622 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2018-07-10 20:56:24 [-0400], Steven Rostedt wrote: > Hi Sebastian, Hi Steven, > I'm looking at backporting patches from 4.16-rt and noticed that you > have: > > Revert "x86: Convert mce timer to hrtimer" > Revert "x86/mce: use swait queue for mce wakeups" > > With no explanation to why they were reverted. When did things change? > Should this be 4.14-rt material? from the announce email: | Changes since v4.16.8-rt2: | | - Drop two MCE related patches. They are no longer required since the | timer wheel rework. The timer wheel rework made it possible to have a raw_spin_lock_t in the timer_list timer. The problem with MCE was that it enqueued a timer from hardirq context which is now possible. So the patches are no longer required. This revert does not fix a bug in v4.14 nor does it break anything. > Thanks, > > -- Steve Sebastian