1 #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 2 #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 3 4 /** 5 * fls - find last (most-significant) bit set 6 * @x: the word to search 7 * 8 * This is defined the same way as ffs. 9 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. 10 */ 11 static __always_inline int fls(int x) 12 { 13 return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; 14 } 15 16 #endif 17