mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 21:38:32 +08:00
40b0b3f8fb
Based on 2 normalized pattern(s): this source code is licensed under the gnu general public license version 2 see the file copying for more details this source code is licensed under general public license version 2 see extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 52 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* From lib/bitmap.c
|
|
* Helper functions for bitmap.h.
|
|
*/
|
|
#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;
|
|
}
|