fls64 32 include/asm-generic/bitops/count_zeros.h return BITS_PER_LONG - fls64(x); fls64 22 include/asm-generic/getorder.h order = fls64(size); fls64 178 include/linux/bitops.h return fls64(l); fls64 42 include/linux/log2.h return fls64(n) - 1;