ec778edf97
Add return value documentation and clarify the units of the @size parameter. Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Cody P Schafer <cody@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
#ifndef _ASM_GENERIC_BITOPS_FIND_H_
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#define _ASM_GENERIC_BITOPS_FIND_H_
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#ifndef find_next_bit
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/**
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* find_next_bit - find the next set bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The bitmap size in bits
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*
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* Returns the bit number for the next set bit
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* If no bits are set, returns @size.
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*/
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extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
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size, unsigned long offset);
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#endif
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#ifndef find_next_zero_bit
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/**
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* find_next_zero_bit - find the next cleared bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The bitmap size in bits
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*
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* Returns the bit number of the next zero bit
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* If no bits are zero, returns @size.
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*/
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extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
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long size, unsigned long offset);
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#endif
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#ifdef CONFIG_GENERIC_FIND_FIRST_BIT
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/**
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* find_first_bit - find the first set bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum number of bits to search
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*
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* Returns the bit number of the first set bit.
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* If no bits are set, returns @size.
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*/
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extern unsigned long find_first_bit(const unsigned long *addr,
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unsigned long size);
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/**
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* find_first_zero_bit - find the first cleared bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum number of bits to search
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*
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* Returns the bit number of the first cleared bit.
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* If no bits are zero, returns @size.
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*/
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extern unsigned long find_first_zero_bit(const unsigned long *addr,
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unsigned long size);
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#else /* CONFIG_GENERIC_FIND_FIRST_BIT */
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#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
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#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
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#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
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#endif /*_ASM_GENERIC_BITOPS_FIND_H_ */
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