bitmap.h

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#include <linux/kernel.h>
 
#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))