1*048fa2dfSCatalin Marinas #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 2*048fa2dfSCatalin Marinas #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ 3*048fa2dfSCatalin Marinas 4*048fa2dfSCatalin Marinas /** 5*048fa2dfSCatalin Marinas * fls - find last (most-significant) bit set 6*048fa2dfSCatalin Marinas * @x: the word to search 7*048fa2dfSCatalin Marinas * 8*048fa2dfSCatalin Marinas * This is defined the same way as ffs. 9*048fa2dfSCatalin Marinas * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. 10*048fa2dfSCatalin Marinas */ 11*048fa2dfSCatalin Marinas static __always_inline int fls(int x) 12*048fa2dfSCatalin Marinas { 13*048fa2dfSCatalin Marinas return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; 14*048fa2dfSCatalin Marinas } 15*048fa2dfSCatalin Marinas 16*048fa2dfSCatalin Marinas #endif 17