Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751113AbbHBJxY (ORCPT ); Sun, 2 Aug 2015 05:53:24 -0400 Received: from www.linutronix.de ([62.245.132.108]:57655 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750714AbbHBJxV (ORCPT ); Sun, 2 Aug 2015 05:53:21 -0400 Date: Sun, 2 Aug 2015 11:52:53 +0200 (CEST) From: Thomas Gleixner To: Taichi Kageyama cc: Peter Hurley , "gregkh@linuxfoundation.org" , "jiang.liu@linux.intel.com" , "linux-serial@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "jslaby@suse.cz" , "prarit@redhat.com" , Naoya Horiguchi , Peter Zijlstra Subject: Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0 for console In-Reply-To: <55BB1D82.909@cp.jp.nec.com> Message-ID: References: <1438157443-19447-1-git-send-email-t-kageyama@cp.jp.nec.com> <55B8BE39.6080500@hurleysoftware.com> <55B8D26A.7000402@hurleysoftware.com> <55B980E6.70800@cp.jp.nec.com> <55BA2A06.1080109@hurleysoftware.com> <55BAB6B5.2090908@hurleysoftware.com> <55BB1D82.909@cp.jp.nec.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII 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 Content-Length: 1120 Lines: 34 On Fri, 31 Jul 2015, Taichi Kageyama wrote: > On 2015/07/31 8:43, Peter Hurley wrote: > >> If you look at the actual autoprobe users aside of 8250. That's really > >> all ancient ISA hardware and hardly interesting. So all we really care > >> about are the 8250 serial ports. > > In this case, I think [patch v2 1/3] is enough. > console_lock is required in autoconfig_irq() to resolve other race conditions > before calling probe_irq_on(). Fine with me. > >> So why are you interested in that serial irq autoprobe crap at all? > > > Because RHEL6 uses CONFIG_SERIAL_8250_DETECT_IRQ=y unfortunately. Doh! > I already got the following console solutions after discussion with Peter. > - Force set irq before any APs and getty open /dev/console. > Users have to know valid irq#. > - Fix FW to define PNP > - CONFIG_SERIAL_8250_DETECT_IRQ=n Ack! Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/