[RFC PATCH v5 17/19] memory_hotplug: clear zone when the memory is removed

From: Yasuaki Ishimatsu When a memory is added, we update zone's and pgdat's start_pfn and spanned_pages in the function __add_zone(). So we should revert these when the memory is removed. Add a new function __remove_zone() to do this. CC: David Rientjes CC: Jiang Liu CC: Len Brown CC:

[RFC PATCH v5 17/19] memory_hotplug: clear zone when the memory is removed

From: Yasuaki Ishimatsu isimatu.yasu...@jp.fujitsu.com When a memory is added, we update zone's and pgdat's start_pfn and spanned_pages in the function __add_zone(). So we should revert these when the memory is removed. Add a new function __remove_zone() to do this. CC: David Rientjes