| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Catalin Marinas | 048fa2d | 2012-09-12 22:00:53 +0100 | [diff] [blame] | 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 |