Release 4.15 tools/include/linux/bitops.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TOOLS_LINUX_BITOPS_H_

#define _TOOLS_LINUX_BITOPS_H_

#include <asm/types.h>
#include <linux/compiler.h>

#ifndef __WORDSIZE

#define __WORDSIZE (__SIZEOF_LONG__ * 8)
#endif

#ifndef BITS_PER_LONG

# define BITS_PER_LONG __WORDSIZE
#endif


#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))

#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)

#define BITS_PER_BYTE		8

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

#define BITS_TO_U64(nr)		DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))

#define BITS_TO_U32(nr)		DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))

#define BITS_TO_BYTES(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE)

extern unsigned int __sw_hweight8(unsigned int w);
extern unsigned int __sw_hweight16(unsigned int w);
extern unsigned int __sw_hweight32(unsigned int w);
extern unsigned long __sw_hweight64(__u64 w);

/*
 * Include this here because some architectures need generic_ffs/fls in
 * scope
 *
 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
 */
#include <asm-generic/bitops.h>


#define for_each_set_bit(bit, addr, size) \
	for ((bit) = find_first_bit((addr), (size));            \
             (bit) < (size);                                    \
             (bit) = find_next_bit((addr), (size), (bit) + 1))


#define for_each_clear_bit(bit, addr, size) \
	for ((bit) = find_first_zero_bit((addr), (size));       \
             (bit) < (size);                                    \
             (bit) = find_next_zero_bit((addr), (size), (bit) + 1))

/* same as for_each_set_bit() but use bit as value to start with */

#define for_each_set_bit_from(bit, addr, size) \
	for ((bit) = find_next_bit((addr), (size), (bit));      \
             (bit) < (size);                                    \
             (bit) = find_next_bit((addr), (size), (bit) + 1))



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

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static inline unsigned fls_long(unsigned long l)
{
	if (sizeof(l) == 4)
		return fls(l);
	return fls64(l);
}

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/**
 * rol32 - rotate a 32-bit value left
 * @word: value to rotate
 * @shift: bits to roll
 */


static inline __u32 rol32(__u32 word, unsigned int shift)
{
	return (word << shift) | (word >> ((-shift) & 31));
}

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#endif
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Arnaldo Carvalho de Melo
130
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33.33%
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13.67%
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6.67%
Robert Richter
24
9.38%
1
6.67%
Frédéric Weisbecker
18
7.03%
1
6.67%
David Ahern
14
5.47%
1
6.67%
Jiri Olsa
12
4.69%
1
6.67%
Irina Tirdea
9
3.52%
1
6.67%
Sukadev Bhattiprolu
7
2.73%
1
6.67%
Ingo Molnar
5
1.95%
1
6.67%
Greg Kroah-Hartman
1
0.39%
1
6.67%
Akinobu Mita
1
0.39%
1
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15
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Directory: tools/include/linux

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