Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _PERF_LINUX_BITOPS_H_
2#define _PERF_LINUX_BITOPS_H_
3
4#include <linux/kernel.h>
5#include <asm/hweight.h>
6
7#define BITS_PER_LONG __WORDSIZE
8#define BITS_PER_BYTE 8
9#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
10
11static inline void set_bit(int nr, unsigned long *addr)
12{
13 addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
14}
15
16static inline void clear_bit(int nr, unsigned long *addr)
17{
18 addr[nr / BITS_PER_LONG] &= ~(1UL << (nr % BITS_PER_LONG));
19}
20
21static __always_inline int test_bit(unsigned int nr, const unsigned long *addr)
22{
23 return ((1UL << (nr % BITS_PER_LONG)) &
24 (((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0;
25}
26
27static inline unsigned long hweight_long(unsigned long w)
28{
29 return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
30}
31
32#endif