1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 3 #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 4 5 /** 6 * fls - find last (most-significant) bit set 7 * @x: the word to search 8 * 9 * This is defined the same way as ffs. 10 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. 11 */ 12 static __always_inline int fls(unsigned int x) 13 { 14 return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; 15 } 16 17 #endif 18