From: Gu Zheng <guz.fnst@cn.fujitsu.com>
To: rafael.j.wysocki@intel.com
Cc: Tejun Heo <tj@kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: ACPI/cpu hotplug: possible lockdep
Date: Wed, 30 Jul 2014 14:10:35 +0800 [thread overview]
Message-ID: <53D88C5B.4060302@cn.fujitsu.com> (raw)
Hi Rafael,
A lockdep warning occurs when hot removing a cpu via sysfs:
echo 1 > /sys/bus/acpi/devices/LNXCPU\:02/eject
The kernel is latest upstream, and the test box is a kvm vm,
detail info as following.
[ 221.755113] ======================================================
[ 221.756189] [ INFO: possible circular locking dependency detected ]
[ 221.756189] 3.16.0-rc7+ #118 Not tainted
[ 221.756189] -------------------------------------------------------
[ 221.756189] kworker/u8:3/62 is trying to acquire lock:
[ 221.756189] (s_active#50){++++.+}, at: [<ffffffff811d4ad8>] kernfs_remove_by_name_ns+0x70/0x8c
[ 221.756189]
[ 221.756189] but task is already holding lock:
[ 221.756189] (cpu_hotplug.lock#2){+.+.+.}, at: [<ffffffff810628f9>] cpu_hotplug_begin+0x4f/0x79
[ 221.756189]
[ 221.756189] which lock already depends on the new lock.
[ 221.756189]
[ 221.756189]
[ 221.756189] the existing dependency chain (in reverse order) is:
[ 221.756189]
-> #3 (cpu_hotplug.lock#2){+.+.+.}:
[ 221.756189] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.756189] [<ffffffff81596187>] mutex_lock_nested+0x6d/0x37a
[ 221.756189] [<ffffffff810628f9>] cpu_hotplug_begin+0x4f/0x79
[ 221.756189] [<ffffffff81062992>] _cpu_up+0x35/0x126
[ 221.756189] [<ffffffff81062af2>] cpu_up+0x6f/0x81
[ 221.756189] [<ffffffff81d11804>] smp_init+0x4e/0x89
[ 221.756189] [<ffffffff81cf5fe2>] kernel_init_freeable+0x13d/0x24b
[ 221.756189] [<ffffffff8158557a>] kernel_init+0xe/0xdf
[ 221.756189] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.756189]
-> #2 (cpu_hotplug.lock){++++++}:
[ 221.756189] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.756189] [<ffffffff810628eb>] cpu_hotplug_begin+0x41/0x79
[ 221.756189] [<ffffffff81062992>] _cpu_up+0x35/0x126
[ 221.756189] [<ffffffff81062af2>] cpu_up+0x6f/0x81
[ 221.756189] [<ffffffff81d11804>] smp_init+0x4e/0x89
[ 221.756189] [<ffffffff81cf5fe2>] kernel_init_freeable+0x13d/0x24b
[ 221.819219] [<ffffffff8158557a>] kernel_init+0xe/0xdf
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219]
[ 221.819219] -> #1 (cpu_add_remove_lock){+.+.+.}:
[ 221.819219] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.819219] [<ffffffff815988ab>] _raw_spin_lock_irqsave+0x4d/0x87
[ 221.819219] [<ffffffff81171959>] __delete_object+0x8e/0xab
[ 221.819219] [<ffffffff81171998>] delete_object_full+0x22/0x2e
[ 221.819219] [<ffffffff81587f84>] kmemleak_free+0x56/0x77
[ 221.819219] [<ffffffff81164dee>] slab_free_hook+0x1e/0x5b
[ 221.819219] [<ffffffff81166e21>] kfree+0xac/0x111
[ 221.819219] [<ffffffff812f0768>] acpi_hotplug_work_fn+0x28/0x2d
[ 221.819219] [<ffffffff81078ff5>] process_one_work+0x207/0x375
[ 221.819219] [<ffffffff8107944f>] worker_thread+0x2bd/0x329
[ 221.819219] [<ffffffff8107ef6e>] kthread+0xba/0xc2
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219]
[ 221.819219] -> #0 (s_active#50){++++.+}:
[ 221.819219] [<ffffffff810a088a>] __lock_acquire+0xb3b/0xe41
[ 221.819219] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.819219] [<ffffffff811d3f97>] __kernfs_remove+0x169/0x2be
[ 221.819219] [<ffffffff811d4ad8>] kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d604c>] sysfs_remove_file_ns+0x15/0x17
[ 221.819219] [<ffffffff8138143e>] device_remove_file+0x19/0x1b
[ 221.819219] [<ffffffff813814f6>] device_remove_attrs+0x2e/0x68
[ 221.819219] [<ffffffff81381658>] device_del+0x128/0x187
[ 221.819219] [<ffffffff813816ff>] device_unregister+0x48/0x54
[ 221.819219] [<ffffffff81387366>] unregister_cpu+0x39/0x55
[ 221.819219] [<ffffffff81008c03>] arch_unregister_cpu+0x23/0x28
[ 221.819219] [<ffffffff812f7a75>] acpi_processor_remove+0x91/0xca
[ 221.819219] [<ffffffff812f51d1>] acpi_bus_trim+0x5a/0x8d
[ 221.819219] [<ffffffff812f71c6>] acpi_device_hotplug+0x301/0x3ff
[ 221.819219] [<ffffffff812f0760>] acpi_hotplug_work_fn+0x20/0x2d
[ 221.819219] [<ffffffff81078ff5>] process_one_work+0x207/0x375
[ 221.819219] [<ffffffff8107944f>] worker_thread+0x2bd/0x329
[ 221.819219] [<ffffffff8107ef6e>] kthread+0xba/0xc2
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219]
[ 221.819219] other info that might help us debug this:
[ 221.819219]
[ 221.819219] Chain exists of:
[ 221.819219] s_active#50 --> cpu_hotplug.lock --> cpu_hotplug.lock#2
[ 221.819219]
[ 221.819219] Possible unsafe locking scenario:
[ 221.819219]
[ 221.819219] CPU0 CPU1
[ 221.819219] ---- ----
[ 221.819219] lock(cpu_hotplug.lock#2);
[ 221.819219] lock(cpu_hotplug.lock);
[ 221.819219] lock(cpu_hotplug.lock#2);
[ 221.819219] lock(s_active#50);
[ 221.819219]
[ 221.819219] *** DEADLOCK ***
[ 221.819219]
[ 221.819219] 7 locks held by kworker/u8:3/62:
[ 221.819219] #0: ("kacpi_hotplug"){.+.+.+}, at: [<ffffffff81078f4d>] process_one_work+0x15f/0x375
[ 221.819219] #1: ((&hpw->work)){+.+.+.}, at: [<ffffffff81078f4d>] process_one_work+0x15f/0x375
[ 221.819219] #2: (device_hotplug_lock){+.+.+.}, at: [<ffffffff81381f7a>] lock_device_hotplug+0x17/0x19
[ 221.819219] #3: (acpi_scan_lock){+.+.+.}, at: [<ffffffff812f6ef2>] acpi_device_hotplug+0x2d/0x3ff
[ 221.819219] #4: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff81062722>] cpu_maps_update_begin+0x17/0x19
[ 221.819219] #5: (cpu_hotplug.lock){++++++}, at: [<ffffffff810628af>] cpu_hotplug_begin+0x5/0x79
[ 221.819219] #6: (cpu_hotplug.lock#2){+.+.+.}, at: [<ffffffff810628f9>] cpu_hotplug_begin+0x4f/0x79
[ 221.819219]
[ 221.819219] stack backtrace:
[ 221.819219] CPU: 1 PID: 62 Comm: kworker/u8:3 Not tainted 3.16.0-rc7+ #118
[ 221.819219] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
[ 221.819219] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[ 221.819219] ffffffff8209cc80 ffff8800372eb968 ffffffff8159266c 00000000000011cf
[ 221.819219] ffffffff820f2840 ffff8800372eb9b8 ffffffff8158e0ce ffff8800372eb9a8
[ 221.819219] ffffffff82485ff0 ffff8800372e2490 ffff8800372e2e68 ffff8800372e2490
[ 221.819219] Call Trace:
[ 221.819219] [<ffffffff8159266c>] dump_stack+0x4e/0x68
[ 221.819219] [<ffffffff8158e0ce>] print_circular_bug+0x1f8/0x209
[ 221.819219] [<ffffffff810a088a>] __lock_acquire+0xb3b/0xe41
[ 221.819219] [<ffffffff811d4ad8>] ? kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.819219] [<ffffffff811d4ad8>] ? kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d3f97>] __kernfs_remove+0x169/0x2be
[ 221.819219] [<ffffffff811d4ad8>] ? kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d3412>] ? kernfs_find_ns+0xdc/0x104
[ 221.819219] [<ffffffff811d4ad8>] kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d604c>] sysfs_remove_file_ns+0x15/0x17
[ 221.819219] [<ffffffff8138143e>] device_remove_file+0x19/0x1b
[ 221.819219] [<ffffffff813814f6>] device_remove_attrs+0x2e/0x68
[ 221.819219] [<ffffffff81381658>] device_del+0x128/0x187
[ 221.819219] [<ffffffff813816ff>] device_unregister+0x48/0x54
[ 221.819219] [<ffffffff81387366>] unregister_cpu+0x39/0x55
[ 221.819219] [<ffffffff81008c03>] arch_unregister_cpu+0x23/0x28
[ 221.819219] [<ffffffff812f7a75>] acpi_processor_remove+0x91/0xca
[ 221.819219] [<ffffffff812f51d1>] acpi_bus_trim+0x5a/0x8d
[ 221.819219] [<ffffffff812f71c6>] acpi_device_hotplug+0x301/0x3ff
[ 221.819219] [<ffffffff812f0760>] acpi_hotplug_work_fn+0x20/0x2d
[ 221.819219] [<ffffffff81078ff5>] process_one_work+0x207/0x375
[ 221.819219] [<ffffffff81078f4d>] ? process_one_work+0x15f/0x375
[ 221.819219] [<ffffffff8107944f>] worker_thread+0x2bd/0x329
[ 221.819219] [<ffffffff81079192>] ? process_scheduled_works+0x2f/0x2f
[ 221.819219] [<ffffffff8107ef6e>] kthread+0xba/0xc2
[ 221.819219] [<ffffffff810a1511>] ? trace_hardirqs_on+0xd/0xf
[ 221.819219] [<ffffffff8107eeb4>] ? __init_kthread_worker+0x59/0x59
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219] [<ffffffff8107eeb4>] ? __init_kthread_worker+0x59/0x59
WARNING: multiple messages have this Message-ID (diff)
From: Gu Zheng <guz.fnst@cn.fujitsu.com>
To: <rafael.j.wysocki@intel.com>
Cc: Tejun Heo <tj@kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: ACPI/cpu hotplug: possible lockdep
Date: Wed, 30 Jul 2014 14:10:35 +0800 [thread overview]
Message-ID: <53D88C5B.4060302@cn.fujitsu.com> (raw)
Hi Rafael,
A lockdep warning occurs when hot removing a cpu via sysfs:
echo 1 > /sys/bus/acpi/devices/LNXCPU\:02/eject
The kernel is latest upstream, and the test box is a kvm vm,
detail info as following.
[ 221.755113] ======================================================
[ 221.756189] [ INFO: possible circular locking dependency detected ]
[ 221.756189] 3.16.0-rc7+ #118 Not tainted
[ 221.756189] -------------------------------------------------------
[ 221.756189] kworker/u8:3/62 is trying to acquire lock:
[ 221.756189] (s_active#50){++++.+}, at: [<ffffffff811d4ad8>] kernfs_remove_by_name_ns+0x70/0x8c
[ 221.756189]
[ 221.756189] but task is already holding lock:
[ 221.756189] (cpu_hotplug.lock#2){+.+.+.}, at: [<ffffffff810628f9>] cpu_hotplug_begin+0x4f/0x79
[ 221.756189]
[ 221.756189] which lock already depends on the new lock.
[ 221.756189]
[ 221.756189]
[ 221.756189] the existing dependency chain (in reverse order) is:
[ 221.756189]
-> #3 (cpu_hotplug.lock#2){+.+.+.}:
[ 221.756189] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.756189] [<ffffffff81596187>] mutex_lock_nested+0x6d/0x37a
[ 221.756189] [<ffffffff810628f9>] cpu_hotplug_begin+0x4f/0x79
[ 221.756189] [<ffffffff81062992>] _cpu_up+0x35/0x126
[ 221.756189] [<ffffffff81062af2>] cpu_up+0x6f/0x81
[ 221.756189] [<ffffffff81d11804>] smp_init+0x4e/0x89
[ 221.756189] [<ffffffff81cf5fe2>] kernel_init_freeable+0x13d/0x24b
[ 221.756189] [<ffffffff8158557a>] kernel_init+0xe/0xdf
[ 221.756189] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.756189]
-> #2 (cpu_hotplug.lock){++++++}:
[ 221.756189] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.756189] [<ffffffff810628eb>] cpu_hotplug_begin+0x41/0x79
[ 221.756189] [<ffffffff81062992>] _cpu_up+0x35/0x126
[ 221.756189] [<ffffffff81062af2>] cpu_up+0x6f/0x81
[ 221.756189] [<ffffffff81d11804>] smp_init+0x4e/0x89
[ 221.756189] [<ffffffff81cf5fe2>] kernel_init_freeable+0x13d/0x24b
[ 221.819219] [<ffffffff8158557a>] kernel_init+0xe/0xdf
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219]
[ 221.819219] -> #1 (cpu_add_remove_lock){+.+.+.}:
[ 221.819219] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.819219] [<ffffffff815988ab>] _raw_spin_lock_irqsave+0x4d/0x87
[ 221.819219] [<ffffffff81171959>] __delete_object+0x8e/0xab
[ 221.819219] [<ffffffff81171998>] delete_object_full+0x22/0x2e
[ 221.819219] [<ffffffff81587f84>] kmemleak_free+0x56/0x77
[ 221.819219] [<ffffffff81164dee>] slab_free_hook+0x1e/0x5b
[ 221.819219] [<ffffffff81166e21>] kfree+0xac/0x111
[ 221.819219] [<ffffffff812f0768>] acpi_hotplug_work_fn+0x28/0x2d
[ 221.819219] [<ffffffff81078ff5>] process_one_work+0x207/0x375
[ 221.819219] [<ffffffff8107944f>] worker_thread+0x2bd/0x329
[ 221.819219] [<ffffffff8107ef6e>] kthread+0xba/0xc2
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219]
[ 221.819219] -> #0 (s_active#50){++++.+}:
[ 221.819219] [<ffffffff810a088a>] __lock_acquire+0xb3b/0xe41
[ 221.819219] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.819219] [<ffffffff811d3f97>] __kernfs_remove+0x169/0x2be
[ 221.819219] [<ffffffff811d4ad8>] kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d604c>] sysfs_remove_file_ns+0x15/0x17
[ 221.819219] [<ffffffff8138143e>] device_remove_file+0x19/0x1b
[ 221.819219] [<ffffffff813814f6>] device_remove_attrs+0x2e/0x68
[ 221.819219] [<ffffffff81381658>] device_del+0x128/0x187
[ 221.819219] [<ffffffff813816ff>] device_unregister+0x48/0x54
[ 221.819219] [<ffffffff81387366>] unregister_cpu+0x39/0x55
[ 221.819219] [<ffffffff81008c03>] arch_unregister_cpu+0x23/0x28
[ 221.819219] [<ffffffff812f7a75>] acpi_processor_remove+0x91/0xca
[ 221.819219] [<ffffffff812f51d1>] acpi_bus_trim+0x5a/0x8d
[ 221.819219] [<ffffffff812f71c6>] acpi_device_hotplug+0x301/0x3ff
[ 221.819219] [<ffffffff812f0760>] acpi_hotplug_work_fn+0x20/0x2d
[ 221.819219] [<ffffffff81078ff5>] process_one_work+0x207/0x375
[ 221.819219] [<ffffffff8107944f>] worker_thread+0x2bd/0x329
[ 221.819219] [<ffffffff8107ef6e>] kthread+0xba/0xc2
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219]
[ 221.819219] other info that might help us debug this:
[ 221.819219]
[ 221.819219] Chain exists of:
[ 221.819219] s_active#50 --> cpu_hotplug.lock --> cpu_hotplug.lock#2
[ 221.819219]
[ 221.819219] Possible unsafe locking scenario:
[ 221.819219]
[ 221.819219] CPU0 CPU1
[ 221.819219] ---- ----
[ 221.819219] lock(cpu_hotplug.lock#2);
[ 221.819219] lock(cpu_hotplug.lock);
[ 221.819219] lock(cpu_hotplug.lock#2);
[ 221.819219] lock(s_active#50);
[ 221.819219]
[ 221.819219] *** DEADLOCK ***
[ 221.819219]
[ 221.819219] 7 locks held by kworker/u8:3/62:
[ 221.819219] #0: ("kacpi_hotplug"){.+.+.+}, at: [<ffffffff81078f4d>] process_one_work+0x15f/0x375
[ 221.819219] #1: ((&hpw->work)){+.+.+.}, at: [<ffffffff81078f4d>] process_one_work+0x15f/0x375
[ 221.819219] #2: (device_hotplug_lock){+.+.+.}, at: [<ffffffff81381f7a>] lock_device_hotplug+0x17/0x19
[ 221.819219] #3: (acpi_scan_lock){+.+.+.}, at: [<ffffffff812f6ef2>] acpi_device_hotplug+0x2d/0x3ff
[ 221.819219] #4: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff81062722>] cpu_maps_update_begin+0x17/0x19
[ 221.819219] #5: (cpu_hotplug.lock){++++++}, at: [<ffffffff810628af>] cpu_hotplug_begin+0x5/0x79
[ 221.819219] #6: (cpu_hotplug.lock#2){+.+.+.}, at: [<ffffffff810628f9>] cpu_hotplug_begin+0x4f/0x79
[ 221.819219]
[ 221.819219] stack backtrace:
[ 221.819219] CPU: 1 PID: 62 Comm: kworker/u8:3 Not tainted 3.16.0-rc7+ #118
[ 221.819219] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
[ 221.819219] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[ 221.819219] ffffffff8209cc80 ffff8800372eb968 ffffffff8159266c 00000000000011cf
[ 221.819219] ffffffff820f2840 ffff8800372eb9b8 ffffffff8158e0ce ffff8800372eb9a8
[ 221.819219] ffffffff82485ff0 ffff8800372e2490 ffff8800372e2e68 ffff8800372e2490
[ 221.819219] Call Trace:
[ 221.819219] [<ffffffff8159266c>] dump_stack+0x4e/0x68
[ 221.819219] [<ffffffff8158e0ce>] print_circular_bug+0x1f8/0x209
[ 221.819219] [<ffffffff810a088a>] __lock_acquire+0xb3b/0xe41
[ 221.819219] [<ffffffff811d4ad8>] ? kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff810a1081>] lock_acquire+0xdb/0x101
[ 221.819219] [<ffffffff811d4ad8>] ? kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d3f97>] __kernfs_remove+0x169/0x2be
[ 221.819219] [<ffffffff811d4ad8>] ? kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d3412>] ? kernfs_find_ns+0xdc/0x104
[ 221.819219] [<ffffffff811d4ad8>] kernfs_remove_by_name_ns+0x70/0x8c
[ 221.819219] [<ffffffff811d604c>] sysfs_remove_file_ns+0x15/0x17
[ 221.819219] [<ffffffff8138143e>] device_remove_file+0x19/0x1b
[ 221.819219] [<ffffffff813814f6>] device_remove_attrs+0x2e/0x68
[ 221.819219] [<ffffffff81381658>] device_del+0x128/0x187
[ 221.819219] [<ffffffff813816ff>] device_unregister+0x48/0x54
[ 221.819219] [<ffffffff81387366>] unregister_cpu+0x39/0x55
[ 221.819219] [<ffffffff81008c03>] arch_unregister_cpu+0x23/0x28
[ 221.819219] [<ffffffff812f7a75>] acpi_processor_remove+0x91/0xca
[ 221.819219] [<ffffffff812f51d1>] acpi_bus_trim+0x5a/0x8d
[ 221.819219] [<ffffffff812f71c6>] acpi_device_hotplug+0x301/0x3ff
[ 221.819219] [<ffffffff812f0760>] acpi_hotplug_work_fn+0x20/0x2d
[ 221.819219] [<ffffffff81078ff5>] process_one_work+0x207/0x375
[ 221.819219] [<ffffffff81078f4d>] ? process_one_work+0x15f/0x375
[ 221.819219] [<ffffffff8107944f>] worker_thread+0x2bd/0x329
[ 221.819219] [<ffffffff81079192>] ? process_scheduled_works+0x2f/0x2f
[ 221.819219] [<ffffffff8107ef6e>] kthread+0xba/0xc2
[ 221.819219] [<ffffffff810a1511>] ? trace_hardirqs_on+0xd/0xf
[ 221.819219] [<ffffffff8107eeb4>] ? __init_kthread_worker+0x59/0x59
[ 221.819219] [<ffffffff8159952c>] ret_from_fork+0x7c/0xb0
[ 221.819219] [<ffffffff8107eeb4>] ? __init_kthread_worker+0x59/0x59
next reply other threads:[~2014-07-30 6:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-30 6:10 Gu Zheng [this message]
2014-07-30 6:10 ` ACPI/cpu hotplug: possible lockdep Gu Zheng
2014-07-30 13:12 ` Rafael J. Wysocki
2014-07-31 7:44 ` Gu Zheng
2014-07-31 7:44 ` Gu Zheng
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53D88C5B.4060302@cn.fujitsu.com \
--to=guz.fnst@cn.fujitsu.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rafael.j.wysocki@intel.com \
--cc=rjw@sisk.pl \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.