PTE_T_LOG2        264 arch/mips/include/asm/pgtable.h #define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)
PTE_T_LOG2         64 arch/powerpc/include/asm/page_32.h #define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)