[PATCH RFC v1] mm: is_mem_section_removable() overhaul

[David Hildenbrand]

On 20.01.20 10:14, David Hildenbrand wrote:
> On 20.01.20 08:48, Michal Hocko wrote:
>> On Fri 17-01-20 08:57:51, Dan Williams wrote:
>> [...]
>>> Unless the user is willing to hold the device_hotplug_lock over the
>>> evaluation then the result is unreliable.
>>
>> Do we want to hold the device_hotplug_lock from this user readable file
>> in the first place? My book says that this just waits to become a
>> problem.
> 
> It was the "big hammer" solution for this RFC.
> 
> I think we could do with a try_lock() on the device_lock() paired with a
> device->removed flag. The latter is helpful for properly catching zombie
> devices on the onlining/offlining path either way (and on my todo list).

We do have dev->p->dead which could come in handy.

-- 
Thanks,

David / dhildenb