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))