LXR linux/tools/perf/util/include/linux/bitops.h

   1#ifndef _PERF_LINUX_BITOPS_H_
   2#define _PERF_LINUX_BITOPS_H_
   3
   4#include <linux/kernel.h>
   5#include <linux/compiler.h>
   6#include <asm/hweight.h>
   7
   8#define BITS_PER_LONG __WORDSIZE
   9#define BITS_PER_BYTE           8
  10#define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
  11
  12static inline void set_bit(int nr, unsigned long *addr)
  13{
  14        addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
  15}
  16
  17static inline void clear_bit(int nr, unsigned long *addr)
  18{
  19        addr[nr / BITS_PER_LONG] &= ~(1UL << (nr % BITS_PER_LONG));
  20}
  21
  22static __always_inline int test_bit(unsigned int nr, const unsigned long *addr)
  23{
  24        return ((1UL << (nr % BITS_PER_LONG)) &
  25                (((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0;
  26}
  27
  28static inline unsigned long hweight_long(unsigned long w)
  29{
  30        return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
  31}
  32
  33#endif
  34