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_ */ 64