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23 lines
599 B
23 lines
599 B
/* lib/bitmap.c pulls in at least two other files. */ |
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#include <linux/bitmap.h> |
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void bitmap_clear(unsigned long *map, unsigned int start, int len) |
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{ |
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unsigned long *p = map + BIT_WORD(start); |
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const unsigned int size = start + len; |
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int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG); |
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unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start); |
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while (len - bits_to_clear >= 0) { |
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*p &= ~mask_to_clear; |
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len -= bits_to_clear; |
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bits_to_clear = BITS_PER_LONG; |
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mask_to_clear = ~0UL; |
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p++; |
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} |
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if (len) { |
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mask_to_clear &= BITMAP_LAST_WORD_MASK(size); |
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*p &= ~mask_to_clear; |
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} |
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}
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