include/asm-generic/bitops/builtin-fls.h

   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