1#include <linux/bitmap.h>
 2
 3void __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
23void __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}