#ifndef _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
  #define _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
  
  /**
   * __fls - find last (most-significant) set bit in a long word
   * @word: the word to search
   *
   * Undefined if no set bit exists, so code should check against 0 first.
   */
  static __always_inline unsigned long __fls(unsigned long word)
  {
  	return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
  }
  
  #endif