| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_GENERIC_BITOPS_FIND_H_ |
| 3 | #define _ASM_GENERIC_BITOPS_FIND_H_ |
| 4 | |
| 5 | #ifndef find_next_bit |
| 6 | /** |
| 7 | * find_next_bit - find the next set bit in a memory region |
| 8 | * @addr: The address to base the search on |
| 9 | * @offset: The bitnumber to start searching at |
| 10 | * @size: The bitmap size in bits |
| 11 | * |
| 12 | * Returns the bit number for the next set bit |
| 13 | * If no bits are set, returns @size. |
| 14 | */ |
| 15 | extern unsigned long find_next_bit(const unsigned long *addr, unsigned long |
| 16 | size, unsigned long offset); |
| 17 | #endif |
| 18 | |
| 19 | #ifndef find_next_zero_bit |
| 20 | /** |
| 21 | * find_next_zero_bit - find the next cleared bit in a memory region |
| 22 | * @addr: The address to base the search on |
| 23 | * @offset: The bitnumber to start searching at |
| 24 | * @size: The bitmap size in bits |
| 25 | * |
| 26 | * Returns the bit number of the next zero bit |
| 27 | * If no bits are zero, returns @size. |
| 28 | */ |
| 29 | extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned |
| 30 | long size, unsigned long offset); |
| 31 | #endif |
| 32 | |
| 33 | #ifdef CONFIG_GENERIC_FIND_FIRST_BIT |
| 34 | |
| 35 | /** |
| 36 | * find_first_bit - find the first set bit in a memory region |
| 37 | * @addr: The address to start the search at |
| 38 | * @size: The maximum number of bits to search |
| 39 | * |
| 40 | * Returns the bit number of the first set bit. |
| 41 | * If no bits are set, returns @size. |
| 42 | */ |
| 43 | extern unsigned long find_first_bit(const unsigned long *addr, |
| 44 | unsigned long size); |
| 45 | |
| 46 | /** |
| 47 | * find_first_zero_bit - find the first cleared bit in a memory region |
| 48 | * @addr: The address to start the search at |
| 49 | * @size: The maximum number of bits to search |
| 50 | * |
| 51 | * Returns the bit number of the first cleared bit. |
| 52 | * If no bits are zero, returns @size. |
| 53 | */ |
| 54 | extern unsigned long find_first_zero_bit(const unsigned long *addr, |
| 55 | unsigned long size); |
| 56 | #else /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
| 57 | |
| 58 | #define find_first_bit(addr, size) find_next_bit((addr), (size), 0) |
| 59 | #define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0) |
| 60 | |
| 61 | #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
| 62 | |
| 63 | #endif /*_ASM_GENERIC_BITOPS_FIND_H_ */ |