On Fri, 2014-04-25 at 08:28 -0400, Tejun Heo wrote:
> On Fri, Apr 25, 2014 at 09:56:10AM +0800, Li Zhong wrote:
> > > A nests cpu subsys mutex under s_active of the online node. B nests
> > > s_active of the online node under the cpu subsys mutex. What am I
> > > missing?
> >
> > From the above
On Fri, Apr 25, 2014 at 09:56:10AM +0800, Li Zhong wrote:
> > A nests cpu subsys mutex under s_active of the online node. B nests
> > s_active of the online node under the cpu subsys mutex. What am I
> > missing?
>
> From the above two chain, I think the problem is cpu_subsys_mutex and
> s_activ
On Thu, 2014-04-24 at 10:32 -0400, Tejun Heo wrote:
> Hello,
>
> On Thu, Apr 24, 2014 at 04:37:23PM +0800, Li Zhong wrote:
> > On Wed, 2014-04-23 at 10:39 -0400, Tejun Heo wrote:
> > After thinking it harder, I still couldn't see ABBA here ...
> >
> > the active protection taken here is for "pro
Hello,
On Thu, Apr 24, 2014 at 04:37:23PM +0800, Li Zhong wrote:
> On Wed, 2014-04-23 at 10:39 -0400, Tejun Heo wrote:
> After thinking it harder, I still couldn't see ABBA here ...
>
> the active protection taken here is for "probe/release" which will not
> be waited for removing something like
On Wed, 2014-04-23 at 10:39 -0400, Tejun Heo wrote:
> On Wed, Apr 23, 2014 at 10:00:26AM +0800, Li Zhong wrote:
> > If you remove cpu0, then the cpu0 directory will be removed, together
> > with the "online" file in the directory, while some other process might
> > be writing 0 or 1 to it.
> >
> >
On Wed, Apr 23, 2014 at 10:00:26AM +0800, Li Zhong wrote:
> If you remove cpu0, then the cpu0 directory will be removed, together
> with the "online" file in the directory, while some other process might
> be writing 0 or 1 to it.
>
> But here, for the probe/release, take "release" for example, if
On Tue, 2014-04-22 at 16:40 -0400, Tejun Heo wrote:
> 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
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
On Mon, 2014-04-21 at 18:38 -0400, Tejun Heo wrote:
> Hello,
>
> On Mon, Apr 21, 2014 at 05:20:59PM +0800, Li Zhong wrote:
> > While auditing the usage of lock_device_hotplug_sysfs() for implementing
> > it in another way in following patch, it seems to me that the code here
> > is to add/remove d
Hello,
On Mon, Apr 21, 2014 at 05:20:59PM +0800, Li Zhong wrote:
> While auditing the usage of lock_device_hotplug_sysfs() for implementing
> it in another way in following patch, it seems to me that the code here
> is to add/remove device, and the files probe/release for cpu bus
> themselves won'
While auditing the usage of lock_device_hotplug_sysfs() for implementing
it in another way in following patch, it seems to me that the code here
is to add/remove device, and the files probe/release for cpu bus
themselves won't be removed.
So it seems to me there is no s_active related deadlock he
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