From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965578AbdAKKDb (ORCPT ); Wed, 11 Jan 2017 05:03:31 -0500 Received: from mail.skyhub.de ([78.46.96.112]:45441 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965533AbdAKKD3 (ORCPT ); Wed, 11 Jan 2017 05:03:29 -0500 Date: Wed, 11 Jan 2017 11:03:23 +0100 From: Borislav Petkov To: "Paul E. McKenney" Cc: "Zheng, Lv" , "Rafael J. Wysocki" , "Wysocki, Rafael J" , "Moore, Robert" , J?rg R?del , lkml , Linux ACPI Subject: Re: 174cc7187e6f ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel Message-ID: <20170111100323.5srwcfmwfsui23db@pd.tnic> References: <20170109231501.xrhwsv46mznw3kqt@pd.tnic> <20170109233204.GG3800@linux.vnet.ibm.com> <20170109234039.mfefmv5dv4shxnfn@pd.tnic> <20170109235211.yetponvbexvalkir@pd.tnic> <20170110022338.GJ3800@linux.vnet.ibm.com> <1AE640813FDE7649BE1B193DEA596E886CE286C3@SHSMSX101.ccr.corp.intel.com> <20170110055129.GK3800@linux.vnet.ibm.com> <20170111092105.3y57tyeskpyjtmxi@pd.tnic> <20170111095156.GR3800@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20170111095156.GR3800@linux.vnet.ibm.com> User-Agent: NeoMutt/20161014 (1.7.1) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 11, 2017 at 01:51:56AM -0800, Paul E. McKenney wrote: > Yes, you could make RCU expedited grace periods go back to using the > requesting task, and that would allow expedited grace periods to run early > in the boot process. But that causes problems with signals and the like > unless you revert a few other patches. The bugzilla is interesting -- > it looks like ACPI was in some cases doing early-boot grace-period waits > some time back? I think this and https://bugzilla.suse.com/show_bug.cgi?id=1017783 is an example of a bunch of toshiba schlaptops which cause the issue. So it looks like ACPI is doing something very early on those which tickles the issue to happen. But this is ACPI - anything can happen! > I have a limping prototype RCU patch that should avoid this problem. > > If all goes well, I will send it out late tomorrow evening, Pacific Time. Attach it to the bugzilla too, pls, because the people there trigger the issue. I have the respective(?) SUSE bug and I can ask people there to run it too. Thanks. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.