Re: [RFC PATCH] kernel/cpu: restart cpu_up when hotplug is disabled

[David Hildenbrand]

>> It's far from perfect I would say, but we really wanted to avoid
>> letting user space having to deal with retry logic.
> 
> What's so hard with retry logic in user space? 
> 
> If you can come up with a reasonable argument why user space cannot be
> fixed, then there is certainly a better solution than slapping a
> msleep(5) at some random place into the code.
Most probably you're right and we should just retry in udev. Staring at
the history, it looks like the -EBUSY might have been returned forever,
so user space just never really triggered it on actual CPU hotplug
because it doesn't usually happen that cpu hotplug is disabled.

-- 
Thanks,

David / dhildenb