GNU Linux-libre 4.19.263-gnu1
[releases.git] / 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