mirror of https://gitee.com/openkylin/linux.git
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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_and_bit
|
|
/**
|
|
* find_next_and_bit - find the next set bit in both memory regions
|
|
* @addr1: The first address to base the search on
|
|
* @addr2: The second 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_and_bit(const unsigned long *addr1,
|
|
const unsigned long *addr2, 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 */
|
|
|
|
#ifndef find_first_bit
|
|
#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
|
|
#endif
|
|
#ifndef find_first_zero_bit
|
|
#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
|
|
#endif
|
|
|
|
#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
|
|
|
|
#endif /*_ASM_GENERIC_BITOPS_FIND_H_ */
|