LXR linux/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 */
  14extern 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 */
  28extern 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 */
  42extern 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 */
  53extern 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_ */
  63