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 */
11static __always_inline __attribute_const__ unsigned int __fls(unsigned long word)
12{
13	return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
14}
15
16#endif