Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _PERF_BITOPS_H
2#define _PERF_BITOPS_H
3
4#include <string.h>
5#include <linux/bitops.h>
6
7#define DECLARE_BITMAP(name,bits) \
8 unsigned long name[BITS_TO_LONGS(bits)]
9
10int __bitmap_weight(const unsigned long *bitmap, int bits);
11void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
12 const unsigned long *bitmap2, int bits);
13
14#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
15
16#define BITMAP_LAST_WORD_MASK(nbits) \
17( \
18 ((nbits) % BITS_PER_LONG) ? \
19 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
20)
21
22#define small_const_nbits(nbits) \
23 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
24
25static inline void bitmap_zero(unsigned long *dst, int nbits)
26{
27 if (small_const_nbits(nbits))
28 *dst = 0UL;
29 else {
30 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
31 memset(dst, 0, len);
32 }
33}
34
35static inline int bitmap_weight(const unsigned long *src, int nbits)
36{
37 if (small_const_nbits(nbits))
38 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
39 return __bitmap_weight(src, nbits);
40}
41
42static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
43 const unsigned long *src2, int nbits)
44{
45 if (small_const_nbits(nbits))
46 *dst = *src1 | *src2;
47 else
48 __bitmap_or(dst, src1, src2, nbits);
49}
50
51/**
52 * test_and_set_bit - Set a bit and return its old value
53 * @nr: Bit to set
54 * @addr: Address to count from
55 */
56static inline int test_and_set_bit(int nr, unsigned long *addr)
57{
58 unsigned long mask = BIT_MASK(nr);
59 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
60 unsigned long old;
61
62 old = *p;
63 *p = old | mask;
64
65 return (old & mask) != 0;
66}
67
68#endif /* _PERF_BITOPS_H */