[PATCH 4.9 033/171] mm/memory_hotplug.c: fix overflow in test_pages_in_a_zone()

4.9-stable review patch. If anyone has any objections, please let me know. -- [ Upstream commit d6d8c8a48291b929b2e039f220f0b62958cccfea ] When mainline introduced commit a96dfddbcc04 ("base/memory, hotplug: fix a kernel oops in show_valid_zones()"), it obtained the valid start

[PATCH 4.9 033/171] mm/memory_hotplug.c: fix overflow in test_pages_in_a_zone()

4.9-stable review patch. If anyone has any objections, please let me know. -- [ Upstream commit d6d8c8a48291b929b2e039f220f0b62958cccfea ] When mainline introduced commit a96dfddbcc04 ("base/memory, hotplug: fix a kernel oops in show_valid_zones()"), it obtained the valid start