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) set bit in a long word
   6  * @word: the word to search
   7  *
   8  * Undefined if no set bit exists, so code should check against 0 first.
   9  */
  10 static __always_inline unsigned long __fls(unsigned long word)
  11 {
  12         return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
  13 }
  14
  15 #endif