bitops.h

#ifndef _PERF_LINUX_BITOPS_H_
#define _PERF_LINUX_BITOPS_H_

#include <linux/kernel.h>
#include <linux/compiler.h>
#include <asm/hweight.h>

#define BITS_PER_LONG __WORDSIZE
#define BITS_PER_BYTE           8
#define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))

static inline void set_bit(int nr, unsigned long *addr)
{
	addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
}

static inline void clear_bit(int nr, unsigned long *addr)
{
	addr[nr / BITS_PER_LONG] &= ~(1UL << (nr % BITS_PER_LONG));
}

static __always_inline int test_bit(unsigned int nr, const unsigned long *addr)
{
	return ((1UL << (nr % BITS_PER_LONG)) &
		(((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0;
}

static inline unsigned long hweight_long(unsigned long w)
{
	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
}

#endif