Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965471Ab2KAUNQ (ORCPT ); Thu, 1 Nov 2012 16:13:16 -0400 Received: from ogre.sisk.pl ([193.178.161.156]:51115 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932415Ab2KAUNL (ORCPT ); Thu, 1 Nov 2012 16:13:11 -0400 From: "Rafael J. Wysocki" To: Toshi Kani Cc: Yinghai Lu , ZhangRui , Andrew Morton , Len Brown , Tang Chen , bhelgaas@google.com, jiang.liu@huawei.com, izumi.taku@jp.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 3/3] Improve container_notify_cb() to support container hot-remove. Date: Thu, 01 Nov 2012 21:17:17 +0100 Message-ID: <1748725.QBg5LLmPOx@vostro.rjw.lan> User-Agent: KMail/4.8.5 (Linux/3.7.0-rc3; KDE/4.8.5; x86_64; ; ) In-Reply-To: <1351797478.19172.103.camel@misato.fc.hp.com> References: <1351668471-31436-1-git-send-email-tangchen@cn.fujitsu.com> <1351797478.19172.103.camel@misato.fc.hp.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4762 Lines: 112 On Thursday, November 01, 2012 01:17:58 PM Toshi Kani wrote: > On Thu, 2012-11-01 at 11:28 -0700, Yinghai Lu wrote: > > On Thu, Nov 1, 2012 at 9:43 AM, Toshi Kani wrote: > > > > > > Rafael pointed out in my CPU hot-remove patch that > > > acpi_bus_hot_remove_device() was not exported for modules. Looks like > > > you have the same problem here. FYI, I just sent the following patch > > > that exports acpi_bus_hot_remove_device() and acpi_os_hotplug_execute(). > > > > > > https://lkml.org/lkml/2012/11/1/225 > > > > acpi_os_hotplug_execute() does not like having good quality yet. > > > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 941) /* > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 942) * We > > can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 943) * > > because the hotplug code may call driver .remove() functions, > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 944) * > > which invoke flush_scheduled_work/acpi_os_wait_events_complete > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 945) * to > > flush these workqueues. > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 946) */ > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 947) queue > > = hp ? kacpi_hotplug_wq : > > c02256be (Zhang Rui 2009-06-23 10:20:29 +0800 948) > > (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); > > 9ac61856 (Bjorn Helgaas 2009-08-31 22:32:10 +0000 949) > > dpc->wait = hp ? 1 : 0; > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 950) > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 951) if > > (queue == kacpi_hotplug_wq) > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 952) > > INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 953) else > > if (queue == kacpi_notify_wq) > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 954) > > INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 955) else > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 956) > > INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > bc73675b (Zhang Rui 2010-03-22 15:48:54 +0800 957) > > > > really don't know why checking queue and call same code in every branch. > > > > from comm: > > > > commit bc73675b99fd9850dd914be01d71af99c5d2a1ae > > Author: Zhang Rui > > Date: Mon Mar 22 15:48:54 2010 +0800 > > > > ACPI: fixes a false alarm from lockdep > > > > fixes a false alarm from lockdep, as acpi hotplug workqueue waits other > > workqueues. > > http://bugzilla.kernel.org/show_bug.cgi?id=14553 > > https://bugzilla.kernel.org/show_bug.cgi?id=15521 > > > > Original-patch-from: Andrew Morton > > Signed-off-by: Shaohua Li > > Signed-off-by: Zhang Rui > > Signed-off-by: Len Brown > > > > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c > > index 8e6d866..900da68 100644 > > --- a/drivers/acpi/osl.c > > +++ b/drivers/acpi/osl.c > > @@ -758,7 +758,14 @@ static acpi_status > > __acpi_os_execute(acpi_execute_type type, > > queue = hp ? kacpi_hotplug_wq : > > (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); > > dpc->wait = hp ? 1 : 0; > > - INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > + > > + if (queue == kacpi_hotplug_wq) > > + INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > + else if (queue == kacpi_notify_wq) > > + INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > + else > > + INIT_WORK(&dpc->work, acpi_os_execute_deferred); > > + > > ret = queue_work(queue, &dpc->work); > > > > if (!ret) { > > > > > > Len or Rafael, > > can you just revert that silly patch? > > Hi Yinghai, > > Per the following thread, the code seems to be written in this way to > allocate a separate lock_class_key for each work queue. It should have > had some comment to explain this, though. > > https://lkml.org/lkml/2009/12/13/304 The code has evolved since then, however, so that it doesn't make sense any more. Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- 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/