LXR linux/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 */
  15extern 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 */
  29extern 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 */
  43extern 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 */
  54extern 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