Re: [RFC PATCH] mm, memory_hotplug: support movable_node for hotplugable nodes

[Reza Arbab]

On Thu, Jun 01, 2017 at 04:22:28PM +0200, Michal Hocko wrote:
> On Thu 01-06-17 16:11:55, Vlastimil Babka wrote:
> > Simple should work, hopefully.
> > - if memory is hotplugged, it's obviously hotplugable, so we don't have
> > to rely on BIOS description.
>
> Not sure I understand. We do not have any information about the hotplug
> status at the time we do online.

The x86 SRAT (or the dt, on other platforms) can describe memory as 
hotpluggable. See memblock_mark_hotplug(). That's only for memory 
present at boot, though.

He's saying that since the memory was added after boot, it is by 
definition hotpluggable. There's no need to check for that 
marking/description.

--
Reza Arbab