diff options
Diffstat (limited to 'lib/bitmap.c')
| -rw-r--r-- | lib/bitmap.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c index ed685127a107..d1cb8a507c60 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -308,6 +308,23 @@ bool __bitmap_intersects(const unsigned long *bitmap1, } EXPORT_SYMBOL(__bitmap_intersects); +bool __bitmap_intersects_and(const unsigned long *bitmap1, + const unsigned long *bitmap2, + const unsigned long *bitmap3, unsigned int bits) +{ + unsigned int k, lim = bits / BITS_PER_LONG; + + for (k = 0; k < lim; ++k) + if (bitmap1[k] & bitmap2[k] & bitmap3[k]) + return true; + + if (bits % BITS_PER_LONG) + if ((bitmap1[k] & bitmap2[k] & bitmap3[k]) & BITMAP_LAST_WORD_MASK(bits)) + return true; + return false; +} +EXPORT_SYMBOL(__bitmap_intersects_and); + bool __bitmap_subset(const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int bits) { |