From: Tejun Heo <tj@kernel.org>
To: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
gregkh@linuxfoundation.org, rafael.j.wysocki@intel.com,
toshi.kani@hp.com
Subject: Re: [RFC PATCH v5 1/2] Use lock_device_hotplug() in cpu_probe_store() and cpu_release_store()
Date: Tue, 22 Apr 2014 16:40:06 -0400 [thread overview]
Message-ID: <20140422204006.GA3615@mtj.dyndns.org> (raw)
In-Reply-To: <1398133777.2805.7.camel@ThinkPad-T5421.cn.ibm.com>
Hello,
On Tue, Apr 22, 2014 at 10:29:37AM +0800, Li Zhong wrote:
> The probe/release files are attribute files for cpu subsys, looks like
> following in sysfs dirs
>
> $ cd /sys/devices/system/cpu/
> $ ls -l
> total 0
> drwxr-xr-x. 7 root root 0 Apr 17 19:00 cpu0
> drwxr-xr-x. 4 root root 0 Apr 17 19:00 cpu1
> drwxr-xr-x. 4 root root 0 Apr 17 19:00 cpu10
> ......
> drwxr-xr-x. 3 root root 0 Apr 20 08:00 cpufreq
> drwxr-xr-x. 2 root root 0 Apr 20 08:00 cpuidle
> -rw-------. 1 root root 65536 Apr 21 00:28 dscr_default
> -r--r--r--. 1 root root 65536 Apr 21 00:28 kernel_max
> -r--r--r--. 1 root root 65536 Apr 21 00:28 offline
> -r--r--r--. 1 root root 65536 Sep 4 2014 online
> -r--r--r--. 1 root root 65536 Apr 21 00:28 possible
> drwxr-xr-x. 2 root root 0 Apr 20 08:00 power
> -r--r--r--. 1 root root 65536 Apr 17 20:46 present
> --w-------. 1 root root 65536 Apr 21 00:28 probe <-----
> --w-------. 1 root root 65536 Apr 21 00:28 release <-----
> -rw-------. 1 root root 65536 Apr 21 00:28 subcores_per_core
> -rw-r--r--. 1 root root 65536 Apr 21 00:28 uevent
>
> From the code, it seems cpu subsys won't be unregistered, and it doesn't
> make sense to remove all the cpus in the system.
I don't think I'm following you. Are you saying that no files which
are protected under the hotplug lock that cpu subsys uses are removed
during offlining?
Thanks.
--
tejun
next prev parent reply other threads:[~2014-04-22 20:40 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-10 9:18 [RFC PATCH] Suppress a device hot remove related lockdep warning Li Zhong
2014-04-10 13:31 ` Tejun Heo
2014-04-11 4:10 ` [RFC PATCH v2] Use kernfs_break_active_protection() for device online store callbacks Li Zhong
2014-04-11 10:26 ` Tejun Heo
2014-04-14 7:47 ` [RFC PATCH v3] " Li Zhong
2014-04-14 20:13 ` Tejun Heo
2014-04-15 2:44 ` Li Zhong
2014-04-15 14:50 ` Tejun Heo
2014-04-16 1:41 ` Li Zhong
2014-04-16 15:17 ` Tejun Heo
2014-04-17 3:05 ` Li Zhong
2014-04-17 15:06 ` Tejun Heo
2014-04-17 6:50 ` [RFC PATCH v4] " Li Zhong
2014-04-17 15:17 ` Tejun Heo
2014-04-18 8:33 ` Li Zhong
2014-04-21 9:20 ` [RFC PATCH v5 1/2] Use lock_device_hotplug() in cpu_probe_store() and cpu_release_store() Li Zhong
2014-04-21 9:23 ` [RFC PATCH v5 2/2] Use kernfs_break_active_protection() for device online store callbacks Li Zhong
2014-04-21 22:46 ` Tejun Heo
2014-04-22 3:34 ` Li Zhong
2014-04-22 10:11 ` Rafael J. Wysocki
2014-04-23 1:50 ` Li Zhong
2014-04-23 10:54 ` Rafael J. Wysocki
2014-04-24 1:13 ` Li Zhong
2014-04-22 20:44 ` Tejun Heo
2014-04-22 22:21 ` Rafael J. Wysocki
2014-04-23 14:23 ` Tejun Heo
2014-04-23 16:12 ` Rafael J. Wysocki
2014-04-23 16:52 ` Tejun Heo
2014-04-24 8:59 ` Li Zhong
2014-04-24 10:02 ` Rafael J. Wysocki
2014-04-25 1:46 ` Li Zhong
2014-04-25 12:47 ` Rafael J. Wysocki
2014-04-28 1:49 ` Li Zhong
2014-04-23 5:03 ` Li Zhong
2014-04-23 10:58 ` Rafael J. Wysocki
2014-04-24 1:33 ` Li Zhong
2014-05-09 8:35 ` Li Zhong
2014-05-09 8:40 ` [RFC PATCH v6 1/2 ] Use lock_device_hotplug() in cpu_probe_store() and cpu_release_store() Li Zhong
2014-05-09 8:40 ` [RFC PATCH v6 2/2] Implement lock_device_hotplug_sysfs() by breaking active protection Li Zhong
2014-04-21 22:38 ` [RFC PATCH v5 1/2] Use lock_device_hotplug() in cpu_probe_store() and cpu_release_store() Tejun Heo
2014-04-22 2:29 ` Li Zhong
2014-04-22 20:40 ` Tejun Heo [this message]
2014-04-23 2:00 ` Li Zhong
2014-04-23 14:39 ` Tejun Heo
2014-04-24 8:37 ` Li Zhong
2014-04-24 14:32 ` Tejun Heo
2014-04-25 1:56 ` Li Zhong
2014-04-25 12:28 ` Tejun Heo
2014-04-28 0:51 ` Li Zhong
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