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kernel/linux-rt-4.4.41/include/asm-generic/bitops/find.h 1.9 KB
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  #ifndef _ASM_GENERIC_BITOPS_FIND_H_
  #define _ASM_GENERIC_BITOPS_FIND_H_
  
  #ifndef find_next_bit
  /**
   * find_next_bit - find the next set bit in a memory region
   * @addr: The address to base the search on
   * @offset: The bitnumber to start searching at
   * @size: The bitmap size in bits
   *
   * Returns the bit number for the next set bit
   * If no bits are set, returns @size.
   */
  extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
  		size, unsigned long offset);
  #endif
  
  #ifndef find_next_zero_bit
  /**
   * find_next_zero_bit - find the next cleared bit in a memory region
   * @addr: The address to base the search on
   * @offset: The bitnumber to start searching at
   * @size: The bitmap size in bits
   *
   * Returns the bit number of the next zero bit
   * If no bits are zero, returns @size.
   */
  extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
  		long size, unsigned long offset);
  #endif
  
  #ifdef CONFIG_GENERIC_FIND_FIRST_BIT
  
  /**
   * find_first_bit - find the first set bit in a memory region
   * @addr: The address to start the search at
   * @size: The maximum number of bits to search
   *
   * Returns the bit number of the first set bit.
   * If no bits are set, returns @size.
   */
  extern unsigned long find_first_bit(const unsigned long *addr,
  				    unsigned long size);
  
  /**
   * find_first_zero_bit - find the first cleared bit in a memory region
   * @addr: The address to start the search at
   * @size: The maximum number of bits to search
   *
   * Returns the bit number of the first cleared bit.
   * If no bits are zero, returns @size.
   */
  extern unsigned long find_first_zero_bit(const unsigned long *addr,
  					 unsigned long size);
  #else /* CONFIG_GENERIC_FIND_FIRST_BIT */
  
  #define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
  #define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
  
  #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
  
  #endif /*_ASM_GENERIC_BITOPS_FIND_H_ */