741c74f55e
Add support to perform logical and on bitmaps. Code taken from kernel's include/linux/bitmap.h. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1470074555-24889-4-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
|
|
* 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];
|
|
}
|
|
|
|
size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
|
|
char *buf, size_t size)
|
|
{
|
|
/* current bit is 'cur', most recently seen range is [rbot, rtop] */
|
|
int cur, rbot, rtop;
|
|
bool first = true;
|
|
size_t ret = 0;
|
|
|
|
rbot = cur = find_first_bit(bitmap, nbits);
|
|
while (cur < nbits) {
|
|
rtop = cur;
|
|
cur = find_next_bit(bitmap, nbits, cur + 1);
|
|
if (cur < nbits && cur <= rtop + 1)
|
|
continue;
|
|
|
|
if (!first)
|
|
ret += scnprintf(buf + ret, size - ret, ",");
|
|
|
|
first = false;
|
|
|
|
ret += scnprintf(buf + ret, size - ret, "%d", rbot);
|
|
if (rbot < rtop)
|
|
ret += scnprintf(buf + ret, size - ret, "-%d", rtop);
|
|
|
|
rbot = cur;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, unsigned int bits)
|
|
{
|
|
unsigned int k;
|
|
unsigned int lim = bits/BITS_PER_LONG;
|
|
unsigned long result = 0;
|
|
|
|
for (k = 0; k < lim; k++)
|
|
result |= (dst[k] = bitmap1[k] & bitmap2[k]);
|
|
if (bits % BITS_PER_LONG)
|
|
result |= (dst[k] = bitmap1[k] & bitmap2[k] &
|
|
BITMAP_LAST_WORD_MASK(bits));
|
|
return result != 0;
|
|
}
|