p4d_index        1214 arch/s390/include/asm/pgtable.h #define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D-1))
p4d_index         942 arch/x86/include/asm/pgtable.h static inline unsigned long p4d_index(unsigned long address)