[PATCH 0/3] memory hotplug: updates and bugfix for is_removable v3

[KAMEZAWA Hiroyuki]

Thank you for review and comments. totally updated.

Problem:

/sys/devices/system/memory/memoryX/removable file shows whether the section
can be offlined or not. Returns "1" if it seems removable.
 
Now, the file uses a similar logic to one offline_pages() uses.
Then, it's better to use unified logic.

The biggest change from previous one is this patch just unifies is_removable()
and offline code's logic. No functional change in offline() code.
(is_removable code is updated to be better.)


Brief patch description:
1. bugfix for is_removable() check. I think this should be back ported. (updated)
2. bugfix for callback at counting immobile pages. (no change)
3. the unified new logic for is_remobable. (updated)

Because I'm moving house, my response may be delayd.

Thanks,
-Kame

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