bitmap.h File Reference

#include <linux/kernel.h>

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Macros
#define	BITS_TO_LONGS(nr)   (((nr) + BITS_PER_LONG - 1) / BITS_PER_LONG)
#define	DECLARE_BITMAP(name, bits)    unsigned long name[BITS_TO_LONGS(bits)]
#define	set_bit(nr, addr)    ((addr)[(nr) / BITS_PER_LONG] |= (1UL << ((nr) % BITS_PER_LONG)))
#define	clear_bit(nr, addr)    ((addr)[(nr) / BITS_PER_LONG] &= ~(1UL << ((nr) % BITS_PER_LONG)))
#define	test_bit(nr, addr)    (!!((addr)[(nr) / BITS_PER_LONG] & (1UL << ((nr) % BITS_PER_LONG))))
#define	test_and_set_bit(nr, addr)    ({int __old = test_bit(nr, addr); set_bit(nr, addr); __old; })
#define	test_and_clear_bit(nr, addr)    ({ int __old = test_bit(nr, addr); clear_bit(nr,addr); __old;})
#define	bitmap_zero(dst, nbits)    memset(dst, 0, BITS_TO_LONGS(nbits) * sizeof(unsigned long))
#define	bitmap_copy(dst, src, nbits)    memcpy(dst, src, BITS_TO_LONGS(nbits) * sizeof(unsigned long))

Macro Definition Documentation

bitmap_copy

#define bitmap_copy	(		dst,
			src,
			nbits
	)		memcpy(dst, src, BITS_TO_LONGS(nbits) * sizeof(unsigned long))

bitmap_zero

#define bitmap_zero	(		dst,
			nbits
	)		memset(dst, 0, BITS_TO_LONGS(nbits) * sizeof(unsigned long))

BITS_TO_LONGS

#define BITS_TO_LONGS

(

nr

)

(((nr) + BITS_PER_LONG - 1) / BITS_PER_LONG)

clear_bit

#define clear_bit	(		nr,
			addr
	)		((addr)[(nr) / BITS_PER_LONG] &= ~(1UL << ((nr) % BITS_PER_LONG)))

DECLARE_BITMAP

#define DECLARE_BITMAP	(		name,
			bits
	)		unsigned long name[BITS_TO_LONGS(bits)]

set_bit

#define set_bit	(		nr,
			addr
	)		((addr)[(nr) / BITS_PER_LONG] |= (1UL << ((nr) % BITS_PER_LONG)))

test_and_clear_bit

#define test_and_clear_bit	(		nr,
			addr
	)		({ int __old = test_bit(nr, addr); clear_bit(nr,addr); __old;})

test_and_set_bit

#define test_and_set_bit	(		nr,
			addr
	)		({int __old = test_bit(nr, addr); set_bit(nr, addr); __old; })

test_bit

#define test_bit	(		nr,
			addr
	)		(!!((addr)[(nr) / BITS_PER_LONG] & (1UL << ((nr) % BITS_PER_LONG))))