STRUCT_PAGE_MAX_SHIFT   37 arch/arm64/include/asm/memory.h 			>> (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT))
STRUCT_PAGE_MAX_SHIFT   98 arch/riscv/include/asm/pgtable.h 	(CONFIG_VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)