bitmap.c

Go to the documentation of this file.

/*
 * From lib/bitmap.c
 * Helper functions for bitmap.h.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */
#include <linux/bitmap.h>

int __bitmap_weight(const unsigned long *bitmap, int bits)
{
    int k, w = 0, lim = bits/BITS_PER_LONG;

    for (k = 0; k < lim; k++)
        w += hweight_long(bitmap[k]);

    if (bits % BITS_PER_LONG)
        w += hweight_long(bitmap[k] & BITMAP_LAST_WORD_MASK(bits));

    return w;
}

void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
         const unsigned long *bitmap2, int bits)
{
    int k;
    int nr = BITS_TO_LONGS(bits);

    for (k = 0; k < nr; k++)
        dst[k] = bitmap1[k] | bitmap2[k];
}