1 /* lib/bitmap.c pulls in at least two other files. */
2 
3 #include <linux/bitmap.h>
4 
5 void bitmap_clear(unsigned long *map, unsigned int start, int len)
6 {
7 	unsigned long *p = map + BIT_WORD(start);
8 	const unsigned int size = start + len;
9 	int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
10 	unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
11 
12 	while (len - bits_to_clear >= 0) {
13 		*p &= ~mask_to_clear;
14 		len -= bits_to_clear;
15 		bits_to_clear = BITS_PER_LONG;
16 		mask_to_clear = ~0UL;
17 		p++;
18 	}
19 	if (len) {
20 		mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
21 		*p &= ~mask_to_clear;
22 	}
23 }
24