https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: f17b5f06cb92ef2250513a1e154c47b78df07d40 authored by Linus Torvalds on 27 January 2019, 23:18:05 UTC
Linux 5.0-rc4
Linux 5.0-rc4
Tip revision: f17b5f0
bitmap.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;
}