[linux-block.git] / include / linux / bitops.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BITOPS_H
#define _LINUX_BITOPS_H

#include <asm/types.h>
#include <linux/bits.h>
#include <linux/typecheck.h>

#include <uapi/linux/kernel.h>

/* Set bits in the first 'n' bytes when loaded from memory */
#ifdef __LITTLE_ENDIAN
#  define aligned_byte_mask(n) ((1UL << 8*(n))-1)
#else
#  define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))
#endif

#define BITS_PER_TYPE(type)	(sizeof(type) * BITS_PER_BYTE)
#define BITS_TO_LONGS(nr)	__KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
#define BITS_TO_U64(nr)		__KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
#define BITS_TO_U32(nr)		__KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
#define BITS_TO_BYTES(nr)	__KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(char))

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);

/*
 * Defined here because those may be needed by architecture-specific static
 * inlines.
 */

#include <asm-generic/bitops/generic-non-atomic.h>

/*
 * Many architecture-specific non-atomic bitops contain inline asm code and due
 * to that the compiler can't optimize them to compile-time expressions or
 * constants. In contrary, generic_*() helpers are defined in pure C and
 * compilers optimize them just well.
 * Therefore, to make `unsigned long foo = 0; __set_bit(BAR, &foo)` effectively
 * equal to `unsigned long foo = BIT(BAR)`, pick the generic C alternative when
 * the arguments can be resolved at compile time. That expression itself is a
 * constant and doesn't bring any functional changes to the rest of cases.
 * The casts to `uintptr_t` are needed to mitigate `-Waddress` warnings when
 * passing a bitmap from .bss or .data (-> `!!addr` is always true).
 */
#define bitop(op, nr, addr)						\
	((__builtin_constant_p(nr) &&					\
	  __builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) &&	\
	  (uintptr_t)(addr) != (uintptr_t)NULL &&			\
	  __builtin_constant_p(*(const unsigned long *)(addr))) ?	\
	 const##op(nr, addr) : op(nr, addr))

#define __set_bit(nr, addr)		bitop(___set_bit, nr, addr)
#define __clear_bit(nr, addr)		bitop(___clear_bit, nr, addr)
#define __change_bit(nr, addr)		bitop(___change_bit, nr, addr)
#define __test_and_set_bit(nr, addr)	bitop(___test_and_set_bit, nr, addr)
#define __test_and_clear_bit(nr, addr)	bitop(___test_and_clear_bit, nr, addr)
#define __test_and_change_bit(nr, addr)	bitop(___test_and_change_bit, nr, addr)
#define test_bit(nr, addr)		bitop(_test_bit, nr, addr)

/*
 * Include this here because some architectures need generic_ffs/fls in
 * scope
 */
#include <asm/bitops.h>

/* Check that the bitops prototypes are sane */
#define __check_bitop_pr(name)						\
	static_assert(__same_type(arch_##name, generic_##name) &&	\
		      __same_type(const_##name, generic_##name) &&	\
		      __same_type(_##name, generic_##name))

__check_bitop_pr(__set_bit);
__check_bitop_pr(__clear_bit);
__check_bitop_pr(__change_bit);
__check_bitop_pr(__test_and_set_bit);
__check_bitop_pr(__test_and_clear_bit);
__check_bitop_pr(__test_and_change_bit);
__check_bitop_pr(test_bit);

#undef __check_bitop_pr

static inline int get_bitmask_order(unsigned int count)
{
	int order;

	order = fls(count);
	return order;	/* We could be slightly more clever with -1 here... */
}

static __always_inline unsigned long hweight_long(unsigned long w)
{
	return sizeof(w) == 4 ? hweight32(w) : hweight64((__u64)w);
}

/**
 * rol64 - rotate a 64-bit value left
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u64 rol64(__u64 word, unsigned int shift)
{
	return (word << (shift & 63)) | (word >> ((-shift) & 63));
}

/**
 * ror64 - rotate a 64-bit value right
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u64 ror64(__u64 word, unsigned int shift)
{
	return (word >> (shift & 63)) | (word << ((-shift) & 63));
}

/**
 * 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 & 31)) | (word >> ((-shift) & 31));
}

/**
 * ror32 - rotate a 32-bit value right
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u32 ror32(__u32 word, unsigned int shift)
{
	return (word >> (shift & 31)) | (word << ((-shift) & 31));
}

/**
 * rol16 - rotate a 16-bit value left
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u16 rol16(__u16 word, unsigned int shift)
{
	return (word << (shift & 15)) | (word >> ((-shift) & 15));
}

/**
 * ror16 - rotate a 16-bit value right
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u16 ror16(__u16 word, unsigned int shift)
{
	return (word >> (shift & 15)) | (word << ((-shift) & 15));
}

/**
 * rol8 - rotate an 8-bit value left
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u8 rol8(__u8 word, unsigned int shift)
{
	return (word << (shift & 7)) | (word >> ((-shift) & 7));
}

/**
 * ror8 - rotate an 8-bit value right
 * @word: value to rotate
 * @shift: bits to roll
 */
static inline __u8 ror8(__u8 word, unsigned int shift)
{
	return (word >> (shift & 7)) | (word << ((-shift) & 7));
}

/**
 * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
 * @value: value to sign extend
 * @index: 0 based bit index (0<=index<32) to sign bit
 *
 * This is safe to use for 16- and 8-bit types as well.
 */
static __always_inline __s32 sign_extend32(__u32 value, int index)
{
	__u8 shift = 31 - index;
	return (__s32)(value << shift) >> shift;
}

/**
 * sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit
 * @value: value to sign extend
 * @index: 0 based bit index (0<=index<64) to sign bit
 */
static __always_inline __s64 sign_extend64(__u64 value, int index)
{
	__u8 shift = 63 - index;
	return (__s64)(value << shift) >> shift;
}

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

static inline int get_count_order(unsigned int count)
{
	if (count == 0)
		return -1;

	return fls(--count);
}

/**
 * get_count_order_long - get order after rounding @l up to power of 2
 * @l: parameter
 *
 * it is same as get_count_order() but with long type parameter
 */
static inline int get_count_order_long(unsigned long l)
{
	if (l == 0UL)
		return -1;
	return (int)fls_long(--l);
}

/**
 * __ffs64 - find first set bit in a 64 bit word
 * @word: The 64 bit word
 *
 * On 64 bit arches this is a synonym for __ffs
 * The result is not defined if no bits are set, so check that @word
 * is non-zero before calling this.
 */
static inline unsigned long __ffs64(u64 word)
{
#if BITS_PER_LONG == 32
	if (((u32)word) == 0UL)
		return __ffs((u32)(word >> 32)) + 32;
#elif BITS_PER_LONG != 64
#error BITS_PER_LONG not 32 or 64
#endif
	return __ffs((unsigned long)word);
}

/**
 * assign_bit - Assign value to a bit in memory
 * @nr: the bit to set
 * @addr: the address to start counting from
 * @value: the value to assign
 */
static __always_inline void assign_bit(long nr, volatile unsigned long *addr,
				       bool value)
{
	if (value)
		set_bit(nr, addr);
	else
		clear_bit(nr, addr);
}

static __always_inline void __assign_bit(long nr, volatile unsigned long *addr,
					 bool value)
{
	if (value)
		__set_bit(nr, addr);
	else
		__clear_bit(nr, addr);
}

/**
 * __ptr_set_bit - Set bit in a pointer's value
 * @nr: the bit to set
 * @addr: the address of the pointer variable
 *
 * Example:
 *	void *p = foo();
 *	__ptr_set_bit(bit, &p);
 */
#define __ptr_set_bit(nr, addr)                         \
	({                                              \
		typecheck_pointer(*(addr));             \
		__set_bit(nr, (unsigned long *)(addr)); \
	})

/**
 * __ptr_clear_bit - Clear bit in a pointer's value
 * @nr: the bit to clear
 * @addr: the address of the pointer variable
 *
 * Example:
 *	void *p = foo();
 *	__ptr_clear_bit(bit, &p);
 */
#define __ptr_clear_bit(nr, addr)                         \
	({                                                \
		typecheck_pointer(*(addr));               \
		__clear_bit(nr, (unsigned long *)(addr)); \
	})

/**
 * __ptr_test_bit - Test bit in a pointer's value
 * @nr: the bit to test
 * @addr: the address of the pointer variable
 *
 * Example:
 *	void *p = foo();
 *	if (__ptr_test_bit(bit, &p)) {
 *	        ...
 *	} else {
 *		...
 *	}
 */
#define __ptr_test_bit(nr, addr)                       \
	({                                             \
		typecheck_pointer(*(addr));            \
		test_bit(nr, (unsigned long *)(addr)); \
	})

#ifdef __KERNEL__

#ifndef set_mask_bits
#define set_mask_bits(ptr, mask, bits)	\
({								\
	const typeof(*(ptr)) mask__ = (mask), bits__ = (bits);	\
	typeof(*(ptr)) old__, new__;				\
								\
	do {							\
		old__ = READ_ONCE(*(ptr));			\
		new__ = (old__ & ~mask__) | bits__;		\
	} while (cmpxchg(ptr, old__, new__) != old__);		\
								\
	old__;							\
})
#endif

#ifndef bit_clear_unless
#define bit_clear_unless(ptr, clear, test)	\
({								\
	const typeof(*(ptr)) clear__ = (clear), test__ = (test);\
	typeof(*(ptr)) old__, new__;				\
								\
	do {							\
		old__ = READ_ONCE(*(ptr));			\
		new__ = old__ & ~clear__;			\
	} while (!(old__ & test__) &&				\
		 cmpxchg(ptr, old__, new__) != old__);		\
								\
	!(old__ & test__);					\
})
#endif

#endif /* __KERNEL__ */
#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_BITOPS_H
1da177e4 LT	3	#define _LINUX_BITOPS_H
aa6159ab	4
1da177e4	5	#include <asm/types.h>
8bd9cb51	6	#include <linux/bits.h>
cb0f8003	7	#include <linux/typecheck.h>
1da177e4	8
aa6159ab AS	9	#include <uapi/linux/kernel.h>
aa6159ab AS	10
f5a1a536 AS	11	/* Set bits in the first 'n' bytes when loaded from memory */
	12	#ifdef __LITTLE_ENDIAN
	13	# define aligned_byte_mask(n) ((1UL << 8*(n))-1)
	14	#else
	15	# define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))
	16	#endif
	17
0bddc1bd	18	#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
aa6159ab AS	19	#define BITS_TO_LONGS(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
	20	#define BITS_TO_U64(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
	21	#define BITS_TO_U32(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
	22	#define BITS_TO_BYTES(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
10ef6b0d	23
4677d4a5 BP	24	extern unsigned int __sw_hweight8(unsigned int w);
	25	extern unsigned int __sw_hweight16(unsigned int w);
	26	extern unsigned int __sw_hweight32(unsigned int w);
	27	extern unsigned long __sw_hweight64(__u64 w);
	28
e69eb9c4 AL	29	/*
	30	* Defined here because those may be needed by architecture-specific static
	31	* inlines.
	32	*/
	33
0e862838 AL	34	#include <asm-generic/bitops/generic-non-atomic.h>
0e862838 AL	35
b03fc117 AL	36	/*
	37	* Many architecture-specific non-atomic bitops contain inline asm code and due
	38	* to that the compiler can't optimize them to compile-time expressions or
	39	* constants. In contrary, generic_*() helpers are defined in pure C and
	40	* compilers optimize them just well.
	41	* Therefore, to make `unsigned long foo = 0; __set_bit(BAR, &foo)` effectively
	42	* equal to `unsigned long foo = BIT(BAR)`, pick the generic C alternative when
	43	* the arguments can be resolved at compile time. That expression itself is a
	44	* constant and doesn't bring any functional changes to the rest of cases.
	45	* The casts to `uintptr_t` are needed to mitigate `-Waddress` warnings when
	46	* passing a bitmap from .bss or .data (-> `!!addr` is always true).
	47	*/
e69eb9c4	48	#define bitop(op, nr, addr) \
b03fc117 AL	49	((__builtin_constant_p(nr) && \
	50	__builtin_constant_p((uintptr_t)(addr) != (uintptr_t)NULL) && \
	51	(uintptr_t)(addr) != (uintptr_t)NULL && \
	52	__builtin_constant_p((const unsigned long )(addr))) ? \
	53	const##op(nr, addr) : op(nr, addr))
e69eb9c4 AL	54
	55	#define __set_bit(nr, addr) bitop(___set_bit, nr, addr)
	56	#define __clear_bit(nr, addr) bitop(___clear_bit, nr, addr)
	57	#define __change_bit(nr, addr) bitop(___change_bit, nr, addr)
	58	#define __test_and_set_bit(nr, addr) bitop(___test_and_set_bit, nr, addr)
	59	#define __test_and_clear_bit(nr, addr) bitop(___test_and_clear_bit, nr, addr)
	60	#define __test_and_change_bit(nr, addr) bitop(___test_and_change_bit, nr, addr)
	61	#define test_bit(nr, addr) bitop(_test_bit, nr, addr)
	62
1da177e4 LT	63	/*
	64	* Include this here because some architectures need generic_ffs/fls in
	65	* scope
	66	*/
	67	#include <asm/bitops.h>
	68
0e862838 AL	69	/* Check that the bitops prototypes are sane */
	70	#define __check_bitop_pr(name) \
	71	static_assert(__same_type(arch_##name, generic_##name) && \
bb7379bf	72	__same_type(const_##name, generic_##name) && \
e69eb9c4	73	__same_type(_##name, generic_##name))
0e862838 AL	74
	75	__check_bitop_pr(__set_bit);
	76	__check_bitop_pr(__clear_bit);
	77	__check_bitop_pr(__change_bit);
	78	__check_bitop_pr(__test_and_set_bit);
	79	__check_bitop_pr(__test_and_clear_bit);
	80	__check_bitop_pr(__test_and_change_bit);
	81	__check_bitop_pr(test_bit);
	82
	83	#undef __check_bitop_pr
	84
1a1d48a4	85	static inline int get_bitmask_order(unsigned int count)
1da177e4 LT	86	{
1da177e4 LT	87	int order;
9f41699e	88
1da177e4 LT	89	order = fls(count);
	90	return order; /* We could be slightly more clever with -1 here... */
	91	}
	92
1a1d48a4	93	static __always_inline unsigned long hweight_long(unsigned long w)
1da177e4	94	{
bd93f003	95	return sizeof(w) == 4 ? hweight32(w) : hweight64((__u64)w);
1da177e4 LT	96	}
1da177e4 LT	97
f2ea0f5f AD	98	/**
	99	* rol64 - rotate a 64-bit value left
	100	* @word: value to rotate
	101	* @shift: bits to roll
	102	*/
	103	static inline __u64 rol64(__u64 word, unsigned int shift)
	104	{
ef4d6f6b	105	return (word << (shift & 63)) \| (word >> ((-shift) & 63));
f2ea0f5f AD	106	}
	107
	108	/**
	109	* ror64 - rotate a 64-bit value right
	110	* @word: value to rotate
	111	* @shift: bits to roll
	112	*/
	113	static inline __u64 ror64(__u64 word, unsigned int shift)
	114	{
ef4d6f6b	115	return (word >> (shift & 63)) \| (word << ((-shift) & 63));
f2ea0f5f AD	116	}
f2ea0f5f AD	117
45f8bde0	118	/**
1da177e4	119	* rol32 - rotate a 32-bit value left
1da177e4 LT	120	* @word: value to rotate
	121	* @shift: bits to roll
	122	*/
	123	static inline __u32 rol32(__u32 word, unsigned int shift)
	124	{
ef4d6f6b	125	return (word << (shift & 31)) \| (word >> ((-shift) & 31));
1da177e4 LT	126	}
1da177e4 LT	127
45f8bde0	128	/**
1da177e4	129	* ror32 - rotate a 32-bit value right
1da177e4 LT	130	* @word: value to rotate
	131	* @shift: bits to roll
	132	*/
	133	static inline __u32 ror32(__u32 word, unsigned int shift)
	134	{
ef4d6f6b	135	return (word >> (shift & 31)) \| (word << ((-shift) & 31));
1da177e4 LT	136	}
1da177e4 LT	137
3afe3925 HH	138	/**
	139	* rol16 - rotate a 16-bit value left
	140	* @word: value to rotate
	141	* @shift: bits to roll
	142	*/
	143	static inline __u16 rol16(__u16 word, unsigned int shift)
	144	{
ef4d6f6b	145	return (word << (shift & 15)) \| (word >> ((-shift) & 15));
3afe3925 HH	146	}
	147
	148	/**
	149	* ror16 - rotate a 16-bit value right
	150	* @word: value to rotate
	151	* @shift: bits to roll
	152	*/
	153	static inline __u16 ror16(__u16 word, unsigned int shift)
	154	{
ef4d6f6b	155	return (word >> (shift & 15)) \| (word << ((-shift) & 15));
3afe3925 HH	156	}
	157
	158	/**
	159	* rol8 - rotate an 8-bit value left
	160	* @word: value to rotate
	161	* @shift: bits to roll
	162	*/
	163	static inline __u8 rol8(__u8 word, unsigned int shift)
	164	{
ef4d6f6b	165	return (word << (shift & 7)) \| (word >> ((-shift) & 7));
3afe3925 HH	166	}
	167
	168	/**
	169	* ror8 - rotate an 8-bit value right
	170	* @word: value to rotate
	171	* @shift: bits to roll
	172	*/
	173	static inline __u8 ror8(__u8 word, unsigned int shift)
	174	{
ef4d6f6b	175	return (word >> (shift & 7)) \| (word << ((-shift) & 7));
3afe3925	176	}
7919a57b AH	177
	178	/**
	179	* sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
	180	* @value: value to sign extend
	181	* @index: 0 based bit index (0<=index<32) to sign bit
e2eb53aa MK	182	*
e2eb53aa MK	183	* This is safe to use for 16- and 8-bit types as well.
7919a57b	184	*/
f80ac98a	185	static __always_inline __s32 sign_extend32(__u32 value, int index)
7919a57b AH	186	{
	187	__u8 shift = 31 - index;
	188	return (__s32)(value << shift) >> shift;
	189	}
3afe3925	190
48e203e2 MK	191	/**
	192	* sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit
	193	* @value: value to sign extend
	194	* @index: 0 based bit index (0<=index<64) to sign bit
	195	*/
f80ac98a	196	static __always_inline __s64 sign_extend64(__u64 value, int index)
48e203e2 MK	197	{
	198	__u8 shift = 63 - index;
	199	return (__s64)(value << shift) >> shift;
	200	}
	201
962749af AM	202	static inline unsigned fls_long(unsigned long l)
	203	{
	204	if (sizeof(l) == 4)
	205	return fls(l);
	206	return fls64(l);
	207	}
	208
252e5c6e	209	static inline int get_count_order(unsigned int count)
252e5c6e	210	{
004fba1a WY	211	if (count == 0)
004fba1a WY	212	return -1;
252e5c6e	213
004fba1a	214	return fls(--count);
252e5c6e	215	}
	216
	217	/**
	218	* get_count_order_long - get order after rounding @l up to power of 2
	219	* @l: parameter
	220	*
	221	* it is same as get_count_order() but with long type parameter
	222	*/
	223	static inline int get_count_order_long(unsigned long l)
	224	{
	225	if (l == 0UL)
	226	return -1;
a9eb6370	227	return (int)fls_long(--l);
252e5c6e	228	}
252e5c6e	229
952043ac SW	230	/**
	231	* __ffs64 - find first set bit in a 64 bit word
	232	* @word: The 64 bit word
	233	*
4945cca2	234	* On 64 bit arches this is a synonym for __ffs
952043ac SW	235	* The result is not defined if no bits are set, so check that @word
	236	* is non-zero before calling this.
	237	*/
	238	static inline unsigned long __ffs64(u64 word)
	239	{
	240	#if BITS_PER_LONG == 32
	241	if (((u32)word) == 0UL)
	242	return __ffs((u32)(word >> 32)) + 32;
	243	#elif BITS_PER_LONG != 64
	244	#error BITS_PER_LONG not 32 or 64
	245	#endif
	246	return __ffs((unsigned long)word);
	247	}
	248
5307e2ad LW	249	/**
	250	* assign_bit - Assign value to a bit in memory
	251	* @nr: the bit to set
	252	* @addr: the address to start counting from
	253	* @value: the value to assign
	254	*/
	255	static __always_inline void assign_bit(long nr, volatile unsigned long *addr,
	256	bool value)
	257	{
	258	if (value)
	259	set_bit(nr, addr);
	260	else
	261	clear_bit(nr, addr);
	262	}
	263
	264	static __always_inline void __assign_bit(long nr, volatile unsigned long *addr,
	265	bool value)
	266	{
	267	if (value)
	268	__set_bit(nr, addr);
	269	else
	270	__clear_bit(nr, addr);
	271	}
	272
cb0f8003 KKD	273	/**
	274	* __ptr_set_bit - Set bit in a pointer's value
	275	* @nr: the bit to set
	276	* @addr: the address of the pointer variable
	277	*
	278	* Example:
	279	* void *p = foo();
	280	* __ptr_set_bit(bit, &p);
	281	*/
	282	#define __ptr_set_bit(nr, addr) \
	283	({ \
	284	typecheck_pointer(*(addr)); \
	285	__set_bit(nr, (unsigned long *)(addr)); \
	286	})
	287
	288	/**
	289	* __ptr_clear_bit - Clear bit in a pointer's value
	290	* @nr: the bit to clear
	291	* @addr: the address of the pointer variable
	292	*
	293	* Example:
	294	* void *p = foo();
	295	* __ptr_clear_bit(bit, &p);
	296	*/
	297	#define __ptr_clear_bit(nr, addr) \
	298	({ \
	299	typecheck_pointer(*(addr)); \
	300	__clear_bit(nr, (unsigned long *)(addr)); \
	301	})
	302
	303	/**
	304	* __ptr_test_bit - Test bit in a pointer's value
	305	* @nr: the bit to test
	306	* @addr: the address of the pointer variable
	307	*
	308	* Example:
	309	* void *p = foo();
	310	* if (__ptr_test_bit(bit, &p)) {
	311	* ...
	312	* } else {
	313	* ...
	314	* }
	315	*/
	316	#define __ptr_test_bit(nr, addr) \
	317	({ \
	318	typecheck_pointer(*(addr)); \
	319	test_bit(nr, (unsigned long *)(addr)); \
	320	})
	321
64970b68	322	#ifdef __KERNEL__
77b9bd9c	323
00a1a053	324	#ifndef set_mask_bits
18127429	325	#define set_mask_bits(ptr, mask, bits) \
00a1a053	326	({ \
18127429 MS	327	const typeof(*(ptr)) mask__ = (mask), bits__ = (bits); \
18127429 MS	328	typeof(*(ptr)) old__, new__; \
00a1a053 TT	329	\
00a1a053 TT	330	do { \
18127429 MS	331	old__ = READ_ONCE(*(ptr)); \
	332	new__ = (old__ & ~mask__) \| bits__; \
	333	} while (cmpxchg(ptr, old__, new__) != old__); \
00a1a053	334	\
1db604f6	335	old__; \
00a1a053 TT	336	})
	337	#endif
	338
85ad1d13	339	#ifndef bit_clear_unless
edfa8728	340	#define bit_clear_unless(ptr, clear, test) \
85ad1d13	341	({ \
edfa8728 MS	342	const typeof(*(ptr)) clear__ = (clear), test__ = (test);\
edfa8728 MS	343	typeof(*(ptr)) old__, new__; \
85ad1d13 GJ	344	\
85ad1d13 GJ	345	do { \
edfa8728 MS	346	old__ = READ_ONCE(*(ptr)); \
	347	new__ = old__ & ~clear__; \
	348	} while (!(old__ & test__) && \
	349	cmpxchg(ptr, old__, new__) != old__); \
85ad1d13	350	\
edfa8728	351	!(old__ & test__); \
85ad1d13 GJ	352	})
	353	#endif
	354
64970b68	355	#endif /* __KERNEL__ */
1da177e4	356	#endif