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
10 int __bitmap_weight(const unsigned long *bitmap, int bits);
11 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
12 const unsigned long *bitmap2, int bits);
13
14 #define BITMAP_LAST_WORD_MASK(nbits) \
15 ( \
16 ((nbits) % BITS_PER_LONG) ? \
17 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
18 )
19
20 #define small_const_nbits(nbits) \
21 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
22
bitmap_zero(unsigned long * dst,int nbits)23 static inline void bitmap_zero(unsigned long *dst, int nbits)
24 {
25 if (small_const_nbits(nbits))
26 *dst = 0UL;
27 else {
28 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
29 memset(dst, 0, len);
30 }
31 }
32
bitmap_weight(const unsigned long * src,int nbits)33 static inline int bitmap_weight(const unsigned long *src, int nbits)
34 {
35 if (small_const_nbits(nbits))
36 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
37 return __bitmap_weight(src, nbits);
38 }
39
bitmap_or(unsigned long * dst,const unsigned long * src1,const unsigned long * src2,int nbits)40 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
41 const unsigned long *src2, int nbits)
42 {
43 if (small_const_nbits(nbits))
44 *dst = *src1 | *src2;
45 else
46 __bitmap_or(dst, src1, src2, nbits);
47 }
48
49 /**
50 * test_and_set_bit - Set a bit and return its old value
51 * @nr: Bit to set
52 * @addr: Address to count from
53 */
test_and_set_bit(int nr,unsigned long * addr)54 static inline int test_and_set_bit(int nr, unsigned long *addr)
55 {
56 unsigned long mask = BIT_MASK(nr);
57 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
58 unsigned long old;
59
60 old = *p;
61 *p = old | mask;
62
63 return (old & mask) != 0;
64 }
65
66 #endif /* _PERF_BITOPS_H */
67