include/asm-generic/bitops/find.h

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