memory-hotplug have such a problem.

[zhong jiang]

           when I test the memory online or offline, I find the problem that
      memory online always return an error. I peform the operation as follow:

  	cd /sys/device/system/memory/
        echo online > state

 	it always print "-bash: echo: write error: Operation not permitted".
        By my alalysis, I find that the error happen in  the memory_notifier(MEM_GOING_ONLINE,&arg)
        in the function(online_pages()).

        The problem occur in the latest kernel versin (linux 4.3.0 -rc4) , but In the lower version
        (linux 3.10) is correct. I think it may be caused by the confilct.


  	Thanks
	zhongjiang

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