| Arnaldo Carvalho de Melo | fb72014 | 2010-04-30 19:31:12 -0300 | [diff] [blame] | 1 | /* |
| 2 | * From lib/bitmap.c |
| 3 | * Helper functions for bitmap.h. |
| 4 | * |
| 5 | * This source code is licensed under the GNU General Public License, |
| 6 | * Version 2. See the file COPYING for more details. |
| 7 | */ |
| 8 | #include <linux/bitmap.h> |
| 9 | |
| 10 | int __bitmap_weight(const unsigned long *bitmap, int bits) |
| 11 | { |
| 12 | int k, w = 0, lim = bits/BITS_PER_LONG; |
| 13 | |
| 14 | for (k = 0; k < lim; k++) |
| 15 | w += hweight_long(bitmap[k]); |
| 16 | |
| 17 | if (bits % BITS_PER_LONG) |
| 18 | w += hweight_long(bitmap[k] & BITMAP_LAST_WORD_MASK(bits)); |
| 19 | |
| 20 | return w; |
| 21 | } |