1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
2048fa2dfSCatalin Marinas #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
3048fa2dfSCatalin Marinas #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
4048fa2dfSCatalin Marinas 
5048fa2dfSCatalin Marinas /**
6048fa2dfSCatalin Marinas  * fls - find last (most-significant) bit set
7048fa2dfSCatalin Marinas  * @x: the word to search
8048fa2dfSCatalin Marinas  *
9048fa2dfSCatalin Marinas  * This is defined the same way as ffs.
10048fa2dfSCatalin Marinas  * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
11048fa2dfSCatalin Marinas  */
fls(unsigned int x)123fc2579eSMatthew Wilcox static __always_inline int fls(unsigned int x)
13048fa2dfSCatalin Marinas {
14048fa2dfSCatalin Marinas 	return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
15048fa2dfSCatalin Marinas }
16048fa2dfSCatalin Marinas 
17048fa2dfSCatalin Marinas #endif
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