From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965024AbeAXRtN (ORCPT ); Wed, 24 Jan 2018 12:49:13 -0500 Received: from mail-qt0-f195.google.com ([209.85.216.195]:45706 "EHLO mail-qt0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964826AbeAXRtM (ORCPT ); Wed, 24 Jan 2018 12:49:12 -0500 X-Google-Smtp-Source: AH8x226fUkxBzS9dcycsC0MsJVsEhaKzN45hEsI+ajn3bFA79rABvtqO68sEejfYh/9swwyJEqa0ag== Message-ID: <1516816150.4109.2.camel@redhat.com> Subject: Re: "irq/matrix: Spread interrupts on allocation" breaks nouveau in mainline kernel From: Lyude Paul To: Thomas Gleixner Cc: hpa@zytor.com, keith.busch@intel.com, mingo@kernel.org, "linux-kernel@vger.kernel.org" Date: Wed, 24 Jan 2018 12:49:10 -0500 In-Reply-To: References: <1516744873.29151.3.camel@redhat.com> <1516757219.29151.7.camel@redhat.com> Organization: Red Hat Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.4 (3.26.4-1.fc27) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, please ignore the warning: it happens before and after the regressing commit (I didn't actually mean to include it on the log I gave here, whoops). As for how I determined nouveau is getting assigned the same IRQ vector as another device, I checked using /sys/kernel/debug/irq. Additionally; when nouveau does initialize properly after resume (e.g. after reverting this patch) I see it get assigned a seperate vector from the other devices. On Wed, 2018-01-24 at 13:52 +0100, Thomas Gleixner wrote: > On Tue, 23 Jan 2018, Lyude Paul wrote: > > > JFYI: I confirmed this patch is definitely broken. I'm seeing nouveau get > > assigned the same MSI vector as another device on the system, which would > > explain why interrupts suddenly stop working. I'll keep looking into it > > further > > tomorrow. > > How did you determine that it is the same MSI vector as another device? > > Thanks, > > tglx > -- Cheers, Lyude Paul