SECTIONS_SHIFT    714 include/linux/mm.h #define ZONEID_SHIFT		(SECTIONS_SHIFT + ZONES_SHIFT)
SECTIONS_SHIFT   1062 include/linux/mmzone.h #define NR_MEM_SECTIONS		(1UL << SECTIONS_SHIFT)
SECTIONS_SHIFT     48 include/linux/page-flags-layout.h #define SECTIONS_WIDTH		SECTIONS_SHIFT