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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
   3 #define _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
   4
   5 /**
   6  * __fls - find last (most-significant) set bit in a long word
   7  * @word: the word to search
   8  *
   9  * Undefined if no set bit exists, so code should check against 0 first.
  10  */
  11 static __always_inline unsigned long __fls(unsigned long word)
  12 {
  13         return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
  14 }
  15
  16 #endif