PMD_BIT4           21 arch/arm/include/asm/pgtable-2level-hwdef.h #define PMD_BIT4		(_AT(pmdval_t, 1) << 4)
PMD_BIT4           22 arch/arm/include/asm/pgtable-3level-hwdef.h #define PMD_BIT4		(_AT(pmdval_t, 0))