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| 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) bit set |
| 7 | * @x: the word to search |
| 8 | * |
| 9 | * This is defined the same way as ffs. |
| 10 | * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. |
| 11 | */ |
| 12 | static __always_inline int fls(unsigned int x) |
| 13 | { |
| 14 | return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; |
| 15 | } |
| 16 | |
| 17 | #endif |
| 18 |
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