Re: [PATCH v4] memory-hotplug: Fix kernel warning during memory hotplug on ppc64

On 01/06/2016 02:30 PM, John Allen wrote:

On any architecture that uses memory_probe_store to reserve memory, the
udev rule will be triggered after the first section of the block is
reserved and will subsequently attempt to online the entire block,
interrupting the memory reservation process and causing the warning.
This patch modifies memory_probe_store to add a block of memory with
a single call to add_memory as opposed to looping through and adding
each section individually. A single call to add_memory is protected by
the mem_hotplug mutex which will prevent the udev rule from onlining
memory until the reservation of the entire block is complete.

Seems sane to me.  Makes the code simpler too, so win win.

Acked-by: Dave Hansen <redacted>