SECTION_MAP_MASK  915 include/linux/mmzone.h 	map &= SECTION_MAP_MASK;
SECTION_MAP_MASK  237 mm/sparse.c    	coded_mem_map &= SECTION_MAP_MASK;
SECTION_MAP_MASK  248 mm/sparse.c    	ms->section_mem_map &= ~SECTION_MAP_MASK;