1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 3*4882a593Smuzhiyun #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /** 6*4882a593Smuzhiyun * fls - find last (most-significant) bit set 7*4882a593Smuzhiyun * @x: the word to search 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * This is defined the same way as ffs. 10*4882a593Smuzhiyun * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. 11*4882a593Smuzhiyun */ fls(unsigned int x)12*4882a593Smuzhiyunstatic __always_inline int fls(unsigned int x) 13*4882a593Smuzhiyun { 14*4882a593Smuzhiyun return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; 15*4882a593Smuzhiyun } 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #endif 18