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Hi All,
I wanted to discuss about one of the corner case exists in 4.9
kernel (4.9.x) where
If hotplug of one of the CPU fails due to failure in one of the
callback,
which is to be called after "notify:online"(as notify_online will create
sysfs nodes
for the hotplug cpu) .
So, while cleaning up notify_dead() does not get called as step->skip_onerr set to
true for "notify:prepare" and due to that sysfs
nodes of that cpu does not get
cleaned up which can cause issue in next hotplug attempt
of that cpu.
                     Â Fails ÂÂ
cpuhp_up_callbacks => cpuhp_invoke_callback => undo_cpu_up
.name = "notify:prepare",
.teardown.single = notify_dead,
.skip_onerr = true,
I think the
possible solution here could be to remove the
-ÂÂÂÂÂÂÂÂÂÂÂ .skip_onerr = true,
for "notify:prepare" so that CPU_DEAD
notification get send.
Please, feel free
to suggest if it has any side-effect as i don't feel any.
Ref:
https://elixir.bootlin.com/linux/v4.9/source/kernel/cpu.c#L458
Cheers,
Mukesh