include/asm-generic/bitops/find.h

   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_ */