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