From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754268AbbKCNq1 (ORCPT ); Tue, 3 Nov 2015 08:46:27 -0500 Received: from www.linutronix.de ([62.245.132.108]:44185 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753088AbbKCNqY (ORCPT ); Tue, 3 Nov 2015 08:46:24 -0500 Subject: Re: [v4.1.10-rt10][PATCH 0/2] PCI: dra7xx/dwc: fix "WARNING: CPU: 1 PID: 82 at kernel/irq/handle.c:150 handle_irq_event_percpu" To: Grygorii Strashko , Thomas Gleixner , linux-rt-users@vger.kernel.org References: <1446492626-24396-1-git-send-email-grygorii.strashko@ti.com> Cc: linux-kernel@vger.kernel.org, Sekhar Nori From: Sebastian Andrzej Siewior Message-ID: <5638BAAE.6050909@linutronix.de> Date: Tue, 3 Nov 2015 14:46:22 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.2.0 MIME-Version: 1.0 In-Reply-To: <1446492626-24396-1-git-send-email-grygorii.strashko@ti.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/02/2015 08:30 PM, Grygorii Strashko wrote: > On -RT above code will generate warnings, because driver_xx_hw_irq_handler() > will be forced threaded (by default) and, as result, generic_handle_irq() > will be called with IRQs enabled. To W/A this issue generic_handle_irq() can > be surrounded by raw_spin_lock_irqsave/irqrestore(wa_lock). and what happens without -RT if you boot threadedirqs? Sebastian