[PATCH 3.12 72/72] x86/mm/hotplug: Modify PGD entry when removing memory

From: Yasuaki Ishimatsu 3.12-stable review patch. If anyone has any objections, please let me know. === commit 9661d5bcd058fe15b4138a00d96bd36516134543 upstream. When hot-adding/removing memory, sync_global_pgds() is called for synchronizing PGD to PGD entries of all processes

[PATCH 3.12 72/72] x86/mm/hotplug: Modify PGD entry when removing memory

From: Yasuaki Ishimatsu 3.12-stable review patch. If anyone has any objections, please let me know. === commit 9661d5bcd058fe15b4138a00d96bd36516134543 upstream. When hot-adding/removing memory, sync_global_pgds() is called for synchronizing PGD to