Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754893Ab3DVJSu (ORCPT ); Mon, 22 Apr 2013 05:18:50 -0400 Received: from mail.skyhub.de ([78.46.96.112]:48819 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753751Ab3DVJSt (ORCPT ); Mon, 22 Apr 2013 05:18:49 -0400 Date: Mon, 22 Apr 2013 11:18:47 +0200 From: Borislav Petkov To: Ingo Molnar Cc: "Paul E. McKenney" , x86-ml , lkml , tiwai@suse.de, Thomas Gleixner Subject: Re: irq 16: nobody cared Message-ID: <20130422091847.GB4637@pd.tnic> References: <20130421165653.GA4623@pd.tnic> <20130421181035.GC4559@pd.tnic> <20130421185609.GD3509@linux.vnet.ibm.com> <20130421190655.GA5807@pd.tnic> <20130421203447.GE3509@linux.vnet.ibm.com> <20130421205139.GC5807@pd.tnic> <20130421214241.GA4593@pd.tnic> <20130421220015.GF3509@linux.vnet.ibm.com> <20130421221242.GB4593@pd.tnic> <20130422080136.GA7080@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20130422080136.GA7080@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1124 Lines: 34 On Mon, Apr 22, 2013 at 10:01:36AM +0200, Ingo Molnar wrote: > Hm, this really smells like a workaround: treating the symptom, not > the cause. Well, I just tested Takashi's add missing synchronize_irq() to the suspend path of snd_hda_intel and it doesn't help. So it could be an issue with this driver or only this hw/driver can exacerbate RCU this much to trigger the spurious irq machinery. > How can an increase in grace-periods break drivers and suspend? Do we > understand exactly what happens there? I'd rather look into Paul's direction here. :) > If we do, can we fix that instead of tweaking the RCU timeouts? Well, I was under the impression yesterday that we actually want to switch to expedited grace periods for suspend/resume *anyway*, regardless of drivers. Paul? -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- -- 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/