1 #include <linux/bitmap.h> 2 3 void __bitmap_set(unsigned long *map, unsigned int start, int len) 4 { 5 unsigned long *p = map + BIT_WORD(start); 6 const unsigned int size = start + len; 7 int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG); 8 unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start); 9 10 while (len - bits_to_set >= 0) { 11 *p |= mask_to_set; 12 len -= bits_to_set; 13 bits_to_set = BITS_PER_LONG; 14 mask_to_set = ~0UL; 15 p++; 16 } 17 if (len) { 18 mask_to_set &= BITMAP_LAST_WORD_MASK(size); 19 *p |= mask_to_set; 20 } 21 } 22 23 void __bitmap_clear(unsigned long *map, unsigned int start, int len) 24 { 25 unsigned long *p = map + BIT_WORD(start); 26 const unsigned int size = start + len; 27 int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG); 28 unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start); 29 30 while (len - bits_to_clear >= 0) { 31 *p &= ~mask_to_clear; 32 len -= bits_to_clear; 33 bits_to_clear = BITS_PER_LONG; 34 mask_to_clear = ~0UL; 35 p++; 36 } 37 if (len) { 38 mask_to_clear &= BITMAP_LAST_WORD_MASK(size); 39 *p &= ~mask_to_clear; 40 } 41 } 42