From patchwork Tue May 21 02:37:24 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Wang X-Patchwork-Id: 2595571 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 3029840276 for ; Tue, 21 May 2013 02:37:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756092Ab3EUChj (ORCPT ); Mon, 20 May 2013 22:37:39 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:56131 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755340Ab3EUChi (ORCPT ); Mon, 20 May 2013 22:37:38 -0400 Received: from /spool/local by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 21 May 2013 12:35:05 +1000 Received: from d23relay04.au.ibm.com (d23relay04.au.ibm.com [9.190.234.120]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 1A4F4357804E; Tue, 21 May 2013 12:37:32 +1000 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r4L2NOXe21102616; Tue, 21 May 2013 12:23:25 +1000 Received: from d23av03.au.ibm.com (loopback [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r4L2bStS009331; Tue, 21 May 2013 12:37:30 +1000 Received: from [9.111.17.47] (wangyun.cn.ibm.com [9.111.17.47]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r4L2bOYq009171; Tue, 21 May 2013 12:37:25 +1000 Message-ID: <519ADDE4.7070900@linux.vnet.ibm.com> Date: Tue, 21 May 2013 10:37:24 +0800 From: Michael Wang User-Agent: Mozilla/5.0 (X11; Linux i686; rv:16.0) Gecko/20121011 Thunderbird/16.0.1 MIME-Version: 1.0 To: Borislav Petkov CC: Viresh Kumar , Tejun Heo , "Paul E. McKenney" , Jiri Kosina , Frederic Weisbecker , Tony Luck , linux-kernel@vger.kernel.org, x86@kernel.org, Thomas Gleixner , rjw@sisk.pl, cpufreq@vger.kernel.org, linux-pm@vger.kernel.org Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule, round 2 References: <20130520045023.GA12690@pd.tnic> <5199C169.7060504@linux.vnet.ibm.com> <20130520064727.GD12690@pd.tnic> <5199C990.3020602@linux.vnet.ibm.com> <5199CB59.1020309@linux.vnet.ibm.com> <5199CFD0.9030101@linux.vnet.ibm.com> <5199E54D.7030407@linux.vnet.ibm.com> <5199EBB5.7060209@linux.vnet.ibm.com> <20130520132355.GF12690@pd.tnic> <519ADA03.5060206@linux.vnet.ibm.com> In-Reply-To: <519ADA03.5060206@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13052102-5140-0000-0000-0000033D8E8B Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On 05/21/2013 10:20 AM, Michael Wang wrote: [snip] > > If hotplug could not happen but still get an offline cpu from > policy->cpus, than we could say it's wrong, otherwise we proved nothing... like this: Would you like to try it and see whether we trigger any WARN? If still trigger WARN, then we could make sure the problem is the wrong 'policy->cpus' ;-) Regards, Michael Wang > > Regards, > Michael Wang > >> + >> + if (!cpu_online(cpu)) >> + goto out; >> + >> mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay); >> + >> + out: >> + put_online_cpus(); >> } >> >> void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy, >> -- >> >> >> [ 94.386340] EXT4-fs (sda7): re-mounted. Opts: (null) >> [ 96.520362] kvm: exiting hardware virtualization >> [ 96.637687] ACPI: Preparing to enter system sleep state S5 >> [ 96.643506] Disabling non-boot CPUs ... >> [ 96.855499] ------------[ cut here ]------------ >> [ 96.860172] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 96.868501] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 96.914238] CPU: 0 PID: 315 Comm: kworker/1:2 Tainted: G W 3.10.0-rc1+ #2 >> [ 96.921969] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 96.929424] Workqueue: events od_dbs_timer >> [ 96.933574] 0000000000000009 ffff88043a08bc78 ffffffff8161445c ffff88043a08bcb8 >> [ 96.941085] ffffffff8103e540 ffff88043b712a80 0000000000000001 ffff88043a296400 >> [ 96.948602] ffff88043b712a80 ffffffff81cdc910 0000000000000001 ffff88043a08bcc8 >> [ 96.956123] Call Trace: >> [ 96.958602] [] dump_stack+0x19/0x1b >> [ 96.963801] [] warn_slowpath_common+0x70/0xa0 >> [ 96.969858] [] warn_slowpath_null+0x1a/0x20 >> [ 96.975735] [] gov_queue_work+0xf0/0x110 >> [ 96.981359] [] od_dbs_timer+0xcb/0x170 >> [ 96.986808] [] process_one_work+0x1fd/0x540 >> [ 96.992691] [] ? process_one_work+0x192/0x540 >> [ 96.998756] [] worker_thread+0x122/0x380 >> [ 97.004371] [] ? rescuer_thread+0x320/0x320 >> [ 97.010256] [] kthread+0xea/0xf0 >> [ 97.015185] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.021605] [] ret_from_fork+0x7c/0xb0 >> [ 97.027049] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.033457] ---[ end trace d36d91c626ac81a0 ]--- >> [ 97.039221] ------------[ cut here ]------------ >> [ 97.039227] ------------[ cut here ]------------ >> [ 97.039229] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 97.039243] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 97.039245] CPU: 4 PID: 82 Comm: kworker/2:1 Tainted: G W 3.10.0-rc1+ #2 >> [ 97.039245] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 97.039248] Workqueue: events od_dbs_timer >> [ 97.039250] 0000000000000009 ffff88043b5cfc78 ffffffff8161445c ffff88043b5cfcb8 >> [ 97.039251] ffffffff8103e540 ffff88043b712a80 0000000000000002 ffff88043a295e00 >> [ 97.039253] ffff88043b712a80 ffffffff81cdc910 0000000000000002 ffff88043b5cfcc8 >> [ 97.039253] Call Trace: >> [ 97.039255] [] dump_stack+0x19/0x1b >> [ 97.039257] [] warn_slowpath_common+0x70/0xa0 >> [ 97.039258] [] warn_slowpath_null+0x1a/0x20 >> [ 97.039259] [] gov_queue_work+0xf0/0x110 >> [ 97.039261] [] od_dbs_timer+0xcb/0x170 >> [ 97.039263] [] process_one_work+0x1fd/0x540 >> [ 97.039264] [] ? process_one_work+0x192/0x540 >> [ 97.039265] [] worker_thread+0x122/0x380 >> [ 97.039267] [] ? rescuer_thread+0x320/0x320 >> [ 97.039268] [] kthread+0xea/0xf0 >> [ 97.039269] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.039270] [] ret_from_fork+0x7c/0xb0 >> [ 97.039272] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.039272] ---[ end trace d36d91c626ac81a1 ]--- >> [ 97.143214] nouveau E[ DRM] GPU lockup - switching to software fbcon >> [ 97.318430] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 97.326804] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 97.374578] CPU: 0 PID: 98 Comm: kworker/3:1 Tainted: G W 3.10.0-rc1+ #2 >> [ 97.384154] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 97.393566] Workqueue: events od_dbs_timer >> [ 97.399675] 0000000000000009 ffff88043b179c78 ffffffff8161445c ffff88043b179cb8 >> [ 97.409153] ffffffff8103e540 ffff88043b712a80 0000000000000003 ffff88043a295a00 >> [ 97.418623] ffff88043b712a80 ffffffff81cdc910 0000000000000003 ffff88043b179cc8 >> [ 97.428103] Call Trace: >> [ 97.432520] [] dump_stack+0x19/0x1b >> [ 97.439678] [] warn_slowpath_common+0x70/0xa0 >> [ 97.447694] [] warn_slowpath_null+0x1a/0x20 >> [ 97.455512] [] gov_queue_work+0xf0/0x110 >> [ 97.462993] [] od_dbs_timer+0xcb/0x170 >> [ 97.470259] [] process_one_work+0x1fd/0x540 >> [ 97.477878] [] ? process_one_work+0x192/0x540 >> [ 97.485652] [] worker_thread+0x122/0x380 >> [ 97.492969] [] ? rescuer_thread+0x320/0x320 >> [ 97.500565] [] kthread+0xea/0xf0 >> [ 97.507167] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.515255] [] ret_from_fork+0x7c/0xb0 >> [ 97.522389] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.530472] ---[ end trace d36d91c626ac81a2 ]--- >> [ 97.543176] ------------[ cut here ]------------ >> [ 97.547172] ------------[ cut here ]------------ >> [ 97.547178] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 97.547197] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 97.547199] CPU: 7 PID: 316 Comm: kworker/5:1 Tainted: G W 3.10.0-rc1+ #2 >> [ 97.547200] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 97.547202] Workqueue: events od_dbs_timer >> [ 97.547204] 0000000000000009 ffff88043905dc78 ffffffff8161445c ffff88043905dcb8 >> [ 97.547205] ffffffff8103e540 ffff88043b712a80 0000000000000005 ffff88043a295800 >> [ 97.547206] ffff88043b712a80 ffffffff81cdc910 0000000000000005 ffff88043905dcc8 >> [ 97.547207] Call Trace: >> [ 97.547211] [] dump_stack+0x19/0x1b >> [ 97.547214] [] warn_slowpath_common+0x70/0xa0 >> [ 97.547215] [] warn_slowpath_null+0x1a/0x20 >> [ 97.547216] [] gov_queue_work+0xf0/0x110 >> [ 97.547218] [] od_dbs_timer+0xcb/0x170 >> [ 97.547220] [] process_one_work+0x1fd/0x540 >> [ 97.547221] [] ? process_one_work+0x192/0x540 >> [ 97.547222] [] worker_thread+0x122/0x380 >> [ 97.547224] [] ? rescuer_thread+0x320/0x320 >> [ 97.547225] [] kthread+0xea/0xf0 >> [ 97.547226] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.547228] [] ret_from_fork+0x7c/0xb0 >> [ 97.547229] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.547230] ---[ end trace d36d91c626ac81a3 ]--- >> [ 97.761326] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 97.770798] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 97.819617] CPU: 0 PID: 253 Comm: kworker/4:1 Tainted: G W 3.10.0-rc1+ #2 >> [ 97.828623] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 97.837372] Workqueue: events od_dbs_timer >> [ 97.842805] 0000000000000009 ffff880439529c78 ffffffff8161445c ffff880439529cb8 >> [ 97.851628] ffffffff8103e540 ffff88043b712a80 0000000000000004 ffff88043a295c00 >> [ 97.860445] ffff88043b712a80 ffffffff81cdc910 0000000000000004 ffff880439529cc8 >> [ 97.869249] Call Trace: >> [ 97.873041] [] dump_stack+0x19/0x1b >> [ 97.879533] [] warn_slowpath_common+0x70/0xa0 >> [ 97.886912] [] warn_slowpath_null+0x1a/0x20 >> [ 97.894100] [] gov_queue_work+0xf0/0x110 >> [ 97.901002] [] od_dbs_timer+0xcb/0x170 >> [ 97.907706] [] process_one_work+0x1fd/0x540 >> [ 97.914797] [] ? process_one_work+0x192/0x540 >> [ 97.922016] [] worker_thread+0x122/0x380 >> [ 97.928803] [] ? rescuer_thread+0x320/0x320 >> [ 97.935837] [] kthread+0xea/0xf0 >> [ 97.941900] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.949443] [] ret_from_fork+0x7c/0xb0 >> [ 97.956027] [] ? flush_kthread_worker+0x150/0x150 >> [ 97.963563] ---[ end trace d36d91c626ac81a4 ]--- >> [ 97.970449] ------------[ cut here ]------------ >> [ 97.976277] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 97.985762] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 98.035051] CPU: 0 PID: 102 Comm: kworker/6:1 Tainted: G W 3.10.0-rc1+ #2 >> [ 98.044067] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 98.052834] Workqueue: events od_dbs_timer >> [ 98.058285] 0000000000000009 ffff88043b6f3c78 ffffffff8161445c ffff88043b6f3cb8 >> [ 98.067114] ffffffff8103e540 ffff88043b712a80 0000000000000006 ffff88043a295600 >> [ 98.075924] ffff88043b712a80 ffffffff81cdc910 0000000000000006 ffff88043b6f3cc8 >> [ 98.084735] Call Trace: >> [ 98.088518] [] dump_stack+0x19/0x1b >> [ 98.095024] [] warn_slowpath_common+0x70/0xa0 >> [ 98.102386] [] warn_slowpath_null+0x1a/0x20 >> [ 98.109565] [] gov_queue_work+0xf0/0x110 >> [ 98.116502] [] od_dbs_timer+0xcb/0x170 >> [ 98.123253] [] process_one_work+0x1fd/0x540 >> [ 98.130394] [] ? process_one_work+0x192/0x540 >> [ 98.137667] [] worker_thread+0x122/0x380 >> [ 98.144456] [] ? rescuer_thread+0x320/0x320 >> [ 98.151510] [] kthread+0xea/0xf0 >> [ 98.157583] [] ? flush_kthread_worker+0x150/0x150 >> [ 98.165143] [] ret_from_fork+0x7c/0xb0 >> [ 98.171730] [] ? flush_kthread_worker+0x150/0x150 >> [ 98.179282] ---[ end trace d36d91c626ac81a5 ]--- >> [ 98.185098] ------------[ cut here ]------------ >> [ 98.190903] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110() >> [ 98.200387] Modules linked in: ext2 vfat fat loop >> [ 98.205029] nouveau W[ PFIFO][0000:03:00.0] unknown intr 0x00400000, ch 1 >> [ 98.214563] usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode >> [ 98.258886] CPU: 0 PID: 318 Comm: kworker/7:1 Tainted: G W 3.10.0-rc1+ #2 >> [ 98.267919] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013 >> [ 98.276689] Workqueue: events od_dbs_timer >> [ 98.282147] 0000000000000009 ffff88043969dc78 ffffffff8161445c ffff88043969dcb8 >> [ 98.290991] ffffffff8103e540 ffff88043b712a80 0000000000000007 ffff88043a295200 >> [ 98.299832] ffff88043b712a80 ffffffff81cdc910 0000000000000007 ffff88043969dcc8 >> [ 98.308671] Call Trace: >> [ 98.312471] [] dump_stack+0x19/0x1b >> [ 98.318982] [] warn_slowpath_common+0x70/0xa0 >> [ 98.326376] [] warn_slowpath_null+0x1a/0x20 >> [ 98.333577] [] gov_queue_work+0xf0/0x110 >> [ 98.340482] [] od_dbs_timer+0xcb/0x170 >> [ 98.347160] [] process_one_work+0x1fd/0x540 >> [ 98.354232] [] ? process_one_work+0x192/0x540 >> [ 98.361471] [] worker_thread+0x122/0x380 >> [ 98.368260] [] ? rescuer_thread+0x320/0x320 >> [ 98.375309] [] kthread+0xea/0xf0 >> [ 98.381385] [] ? flush_kthread_worker+0x150/0x150 >> [ 98.388951] [] ret_from_fork+0x7c/0xb0 >> [ 98.395546] [] ? flush_kthread_worker+0x150/0x150 >> [ 98.403097] ---[ end trace d36d91c626ac81a6 ]--- >> [ 98.409180] Power down. >> [ 98.413109] acpi_power_off called >> > --- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index 443442d..8ed8b35 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -26,6 +26,7 @@ #include #include #include +#include #include "cpufreq_governor.h" @@ -169,6 +170,9 @@ static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data, { struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu); + if (WARN_ON(!cpu_online(cpu))) + return; + mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay); } @@ -180,8 +184,10 @@ void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy, if (!all_cpus) { __gov_queue_work(smp_processor_id(), dbs_data, delay); } else { + get_online_cpus(); for_each_cpu(i, policy->cpus) __gov_queue_work(i, dbs_data, delay); + put_online_cpus(); } } EXPORT_SYMBOL_GPL(gov_queue_work);