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 int __fls(unsigned long word)
12 {
13 return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
14 }
15
16 #endif
17
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