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=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 DA733C3F68F for ; Wed, 29 Jan 2020 21:01:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3694206F0 for ; Wed, 29 Jan 2020 21:01:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727402AbgA2VBJ (ORCPT ); Wed, 29 Jan 2020 16:01:09 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:51920 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727208AbgA2VBI (ORCPT ); Wed, 29 Jan 2020 16:01:08 -0500 Received: from 51.26-246-81.adsl-static.isp.belgacom.be ([81.246.26.51] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1iwuSO-0006I8-S8; Wed, 29 Jan 2020 22:01:05 +0100 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id 02740105CFD; Wed, 29 Jan 2020 22:00:58 +0100 (CET) From: Thomas Gleixner To: Evan Green Cc: Rajat Jain , Bjorn Helgaas , linux-pci , Linux Kernel Mailing List , x86@kernel.org, Marc Zyngier Subject: Re: [PATCH v2] PCI/MSI: Avoid torn updates to MSI pairs In-Reply-To: References: <20200117162444.v2.1.I9c7e72144ef639cc135ea33ef332852a6b33730f@changeid> <87y2tytv5i.fsf@nanos.tec.linutronix.de> <87eevqkpgn.fsf@nanos.tec.linutronix.de> <87d0b82a9o.fsf@nanos.tec.linutronix.de> <878slwmpu9.fsf@nanos.tec.linutronix.de> <87imkv63yf.fsf@nanos.tec.linutronix.de> <87pnf342pr.fsf@nanos.tec.linutronix.de> Date: Wed, 29 Jan 2020 22:00:58 +0100 Message-ID: <877e1a2d11.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Evan, Evan Green writes: > On Tue, Jan 28, 2020 at 2:48 PM Thomas Gleixner wrote: >> >> Bah. I'm sure I looked at that call chain, noticed the double vector >> lock and then forgot. Delta patch below. > > It's working well with the delta patch, been running for about an hour > with no issues. thanks for the info and for testing! Could you please add some instrumentation to see how often this stuff actually triggers spurious interrupts? Thanks, tglx