| Catalin Marinas | 048fa2d | 2012-09-12 22:00:53 +0100 | [diff] [blame] | 1 | #ifndef _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_ |
| 2 | #define _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_ | ||||
| 3 | |||||
| 4 | /** | ||||
| 5 | * __fls - find last (most-significant) set bit in a long word | ||||
| 6 | * @word: the word to search | ||||
| 7 | * | ||||
| 8 | * Undefined if no set bit exists, so code should check against 0 first. | ||||
| 9 | */ | ||||
| 10 | static __always_inline unsigned long __fls(unsigned long word) | ||||
| 11 | { | ||||
| 12 | return (sizeof(word) * 8) - 1 - __builtin_clzl(word); | ||||
| 13 | } | ||||
| 14 | |||||
| 15 | #endif | ||||