[linux-block.git] / include / linux / math64.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MATH64_H
#define _LINUX_MATH64_H

#include <linux/types.h>
#include <linux/math.h>
#include <vdso/math64.h>
#include <asm/div64.h>

#if BITS_PER_LONG == 64

#define div64_long(x, y) div64_s64((x), (y))
#define div64_ul(x, y)   div64_u64((x), (y))

/**
 * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
 * @dividend: unsigned 64bit dividend
 * @divisor: unsigned 32bit divisor
 * @remainder: pointer to unsigned 32bit remainder
 *
 * Return: sets ``*remainder``, then returns dividend / divisor
 *
 * This is commonly provided by 32bit archs to provide an optimized 64bit
 * divide.
 */
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
	*remainder = dividend % divisor;
	return dividend / divisor;
}

/**
 * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
 * @dividend: signed 64bit dividend
 * @divisor: signed 32bit divisor
 * @remainder: pointer to signed 32bit remainder
 *
 * Return: sets ``*remainder``, then returns dividend / divisor
 */
static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
{
	*remainder = dividend % divisor;
	return dividend / divisor;
}

/**
 * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
 * @dividend: unsigned 64bit dividend
 * @divisor: unsigned 64bit divisor
 * @remainder: pointer to unsigned 64bit remainder
 *
 * Return: sets ``*remainder``, then returns dividend / divisor
 */
static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
{
	*remainder = dividend % divisor;
	return dividend / divisor;
}

/**
 * div64_u64 - unsigned 64bit divide with 64bit divisor
 * @dividend: unsigned 64bit dividend
 * @divisor: unsigned 64bit divisor
 *
 * Return: dividend / divisor
 */
static inline u64 div64_u64(u64 dividend, u64 divisor)
{
	return dividend / divisor;
}

/**
 * div64_s64 - signed 64bit divide with 64bit divisor
 * @dividend: signed 64bit dividend
 * @divisor: signed 64bit divisor
 *
 * Return: dividend / divisor
 */
static inline s64 div64_s64(s64 dividend, s64 divisor)
{
	return dividend / divisor;
}

#elif BITS_PER_LONG == 32

#define div64_long(x, y) div_s64((x), (y))
#define div64_ul(x, y)   div_u64((x), (y))

#ifndef div_u64_rem
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
	*remainder = do_div(dividend, divisor);
	return dividend;
}
#endif

#ifndef div_s64_rem
extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
#endif

#ifndef div64_u64_rem
extern u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder);
#endif

#ifndef div64_u64
extern u64 div64_u64(u64 dividend, u64 divisor);
#endif

#ifndef div64_s64
extern s64 div64_s64(s64 dividend, s64 divisor);
#endif

#endif /* BITS_PER_LONG */

/**
 * div_u64 - unsigned 64bit divide with 32bit divisor
 * @dividend: unsigned 64bit dividend
 * @divisor: unsigned 32bit divisor
 *
 * This is the most common 64bit divide and should be used if possible,
 * as many 32bit archs can optimize this variant better than a full 64bit
 * divide.
 *
 * Return: dividend / divisor
 */
#ifndef div_u64
static inline u64 div_u64(u64 dividend, u32 divisor)
{
	u32 remainder;
	return div_u64_rem(dividend, divisor, &remainder);
}
#endif

/**
 * div_s64 - signed 64bit divide with 32bit divisor
 * @dividend: signed 64bit dividend
 * @divisor: signed 32bit divisor
 *
 * Return: dividend / divisor
 */
#ifndef div_s64
static inline s64 div_s64(s64 dividend, s32 divisor)
{
	s32 remainder;
	return div_s64_rem(dividend, divisor, &remainder);
}
#endif

u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);

#ifndef mul_u32_u32
/*
 * Many a GCC version messes this up and generates a 64x64 mult :-(
 */
static inline u64 mul_u32_u32(u32 a, u32 b)
{
	return (u64)a * b;
}
#endif

#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)

#ifndef mul_u64_u32_shr
static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
{
	return (u64)(((unsigned __int128)a * mul) >> shift);
}
#endif /* mul_u64_u32_shr */

#ifndef mul_u64_u64_shr
static inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
{
	return (u64)(((unsigned __int128)a * mul) >> shift);
}
#endif /* mul_u64_u64_shr */

#else

#ifndef mul_u64_u32_shr
static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
{
	u32 ah, al;
	u64 ret;

	al = a;
	ah = a >> 32;

	ret = mul_u32_u32(al, mul) >> shift;
	if (ah)
		ret += mul_u32_u32(ah, mul) << (32 - shift);

	return ret;
}
#endif /* mul_u64_u32_shr */

#ifndef mul_u64_u64_shr
static inline u64 mul_u64_u64_shr(u64 a, u64 b, unsigned int shift)
{
	union {
		u64 ll;
		struct {
#ifdef __BIG_ENDIAN
			u32 high, low;
#else
			u32 low, high;
#endif
		} l;
	} rl, rm, rn, rh, a0, b0;
	u64 c;

	a0.ll = a;
	b0.ll = b;

	rl.ll = mul_u32_u32(a0.l.low, b0.l.low);
	rm.ll = mul_u32_u32(a0.l.low, b0.l.high);
	rn.ll = mul_u32_u32(a0.l.high, b0.l.low);
	rh.ll = mul_u32_u32(a0.l.high, b0.l.high);

	/*
	 * Each of these lines computes a 64-bit intermediate result into "c",
	 * starting at bits 32-95.  The low 32-bits go into the result of the
	 * multiplication, the high 32-bits are carried into the next step.
	 */
	rl.l.high = c = (u64)rl.l.high + rm.l.low + rn.l.low;
	rh.l.low = c = (c >> 32) + rm.l.high + rn.l.high + rh.l.low;
	rh.l.high = (c >> 32) + rh.l.high;

	/*
	 * The 128-bit result of the multiplication is in rl.ll and rh.ll,
	 * shift it right and throw away the high part of the result.
	 */
	if (shift == 0)
		return rl.ll;
	if (shift < 64)
		return (rl.ll >> shift) | (rh.ll << (64 - shift));
	return rh.ll >> (shift & 63);
}
#endif /* mul_u64_u64_shr */

#endif

#ifndef mul_s64_u64_shr
static inline u64 mul_s64_u64_shr(s64 a, u64 b, unsigned int shift)
{
	u64 ret;

	/*
	 * Extract the sign before the multiplication and put it back
	 * afterwards if needed.
	 */
	ret = mul_u64_u64_shr(abs(a), b, shift);

	if (a < 0)
		ret = -((s64) ret);

	return ret;
}
#endif /* mul_s64_u64_shr */

#ifndef mul_u64_u32_div
static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
{
	union {
		u64 ll;
		struct {
#ifdef __BIG_ENDIAN
			u32 high, low;
#else
			u32 low, high;
#endif
		} l;
	} u, rl, rh;

	u.ll = a;
	rl.ll = mul_u32_u32(u.l.low, mul);
	rh.ll = mul_u32_u32(u.l.high, mul) + rl.l.high;

	/* Bits 32-63 of the result will be in rh.l.low. */
	rl.l.high = do_div(rh.ll, divisor);

	/* Bits 0-31 of the result will be in rl.l.low.	*/
	do_div(rl.ll, divisor);

	rl.l.high = rh.l.low;
	return rl.ll;
}
#endif /* mul_u64_u32_div */

u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div);

/**
 * DIV64_U64_ROUND_UP - unsigned 64bit divide with 64bit divisor rounded up
 * @ll: unsigned 64bit dividend
 * @d: unsigned 64bit divisor
 *
 * Divide unsigned 64bit dividend by unsigned 64bit divisor
 * and round up.
 *
 * Return: dividend / divisor rounded up
 */
#define DIV64_U64_ROUND_UP(ll, d)	\
	({ u64 _tmp = (d); div64_u64((ll) + _tmp - 1, _tmp); })

/**
 * DIV64_U64_ROUND_CLOSEST - unsigned 64bit divide with 64bit divisor rounded to nearest integer
 * @dividend: unsigned 64bit dividend
 * @divisor: unsigned 64bit divisor
 *
 * Divide unsigned 64bit dividend by unsigned 64bit divisor
 * and round to closest integer.
 *
 * Return: dividend / divisor rounded to nearest integer
 */
#define DIV64_U64_ROUND_CLOSEST(dividend, divisor)	\
	({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); })

/**
 * DIV_U64_ROUND_CLOSEST - unsigned 64bit divide with 32bit divisor rounded to nearest integer
 * @dividend: unsigned 64bit dividend
 * @divisor: unsigned 32bit divisor
 *
 * Divide unsigned 64bit dividend by unsigned 32bit divisor
 * and round to closest integer.
 *
 * Return: dividend / divisor rounded to nearest integer
 */
#define DIV_U64_ROUND_CLOSEST(dividend, divisor)	\
	({ u32 _tmp = (divisor); div_u64((u64)(dividend) + _tmp / 2, _tmp); })

/**
 * DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer
 * @dividend: signed 64bit dividend
 * @divisor: signed 32bit divisor
 *
 * Divide signed 64bit dividend by signed 32bit divisor
 * and round to closest integer.
 *
 * Return: dividend / divisor rounded to nearest integer
 */
#define DIV_S64_ROUND_CLOSEST(dividend, divisor)(	\
{							\
	s64 __x = (dividend);				\
	s32 __d = (divisor);				\
	((__x > 0) == (__d > 0)) ?			\
		div_s64((__x + (__d / 2)), __d) :	\
		div_s64((__x - (__d / 2)), __d);	\
}							\
)
#endif /* _LINUX_MATH64_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
2418f4f2 RZ	2	#ifndef _LINUX_MATH64_H
	3	#define _LINUX_MATH64_H
	4
	5	#include <linux/types.h>
605a140a	6	#include <linux/math.h>
b874b835	7	#include <vdso/math64.h>
2418f4f2 RZ	8	#include <asm/div64.h>
	9
	10	#if BITS_PER_LONG == 64
	11
c2853c8d AS	12	#define div64_long(x, y) div64_s64((x), (y))
c2853c8d AS	13	#define div64_ul(x, y) div64_u64((x), (y))
f910381a	14
2418f4f2 RZ	15	/**
2418f4f2 RZ	16	* div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
078843f7 RD	17	* @dividend: unsigned 64bit dividend
	18	* @divisor: unsigned 32bit divisor
	19	* @remainder: pointer to unsigned 32bit remainder
	20	*
	21	* Return: sets ``*remainder``, then returns dividend / divisor
2418f4f2 RZ	22	*
	23	* This is commonly provided by 32bit archs to provide an optimized 64bit
	24	* divide.
	25	*/
	26	static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
	27	{
	28	*remainder = dividend % divisor;
	29	return dividend / divisor;
	30	}
	31
d28a1de5	32	/**
2418f4f2	33	* div_s64_rem - signed 64bit divide with 32bit divisor with remainder
078843f7 RD	34	* @dividend: signed 64bit dividend
	35	* @divisor: signed 32bit divisor
	36	* @remainder: pointer to signed 32bit remainder
	37	*
	38	* Return: sets ``*remainder``, then returns dividend / divisor
2418f4f2 RZ	39	*/
	40	static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
	41	{
	42	*remainder = dividend % divisor;
	43	return dividend / divisor;
	44	}
	45
d28a1de5	46	/**
eb18cba7	47	* div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
078843f7 RD	48	* @dividend: unsigned 64bit dividend
	49	* @divisor: unsigned 64bit divisor
	50	* @remainder: pointer to unsigned 64bit remainder
	51	*
	52	* Return: sets ``*remainder``, then returns dividend / divisor
eb18cba7 MS	53	*/
	54	static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
	55	{
	56	*remainder = dividend % divisor;
	57	return dividend / divisor;
	58	}
	59
d28a1de5	60	/**
6f6d6a1a	61	* div64_u64 - unsigned 64bit divide with 64bit divisor
078843f7 RD	62	* @dividend: unsigned 64bit dividend
	63	* @divisor: unsigned 64bit divisor
	64	*
	65	* Return: dividend / divisor
6f6d6a1a RZ	66	*/
	67	static inline u64 div64_u64(u64 dividend, u64 divisor)
	68	{
	69	return dividend / divisor;
	70	}
	71
d28a1de5	72	/**
658716d1	73	* div64_s64 - signed 64bit divide with 64bit divisor
078843f7 RD	74	* @dividend: signed 64bit dividend
	75	* @divisor: signed 64bit divisor
	76	*
	77	* Return: dividend / divisor
658716d1 BB	78	*/
	79	static inline s64 div64_s64(s64 dividend, s64 divisor)
	80	{
	81	return dividend / divisor;
	82	}
	83
2418f4f2 RZ	84	#elif BITS_PER_LONG == 32
2418f4f2 RZ	85
c2853c8d AS	86	#define div64_long(x, y) div_s64((x), (y))
c2853c8d AS	87	#define div64_ul(x, y) div_u64((x), (y))
f910381a	88
2418f4f2 RZ	89	#ifndef div_u64_rem
	90	static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
	91	{
	92	*remainder = do_div(dividend, divisor);
	93	return dividend;
	94	}
	95	#endif
	96
	97	#ifndef div_s64_rem
	98	extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
	99	#endif
	100
eb18cba7 MS	101	#ifndef div64_u64_rem
	102	extern u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder);
	103	#endif
	104
6f6d6a1a	105	#ifndef div64_u64
f3002134	106	extern u64 div64_u64(u64 dividend, u64 divisor);
6f6d6a1a RZ	107	#endif
6f6d6a1a RZ	108
658716d1 BB	109	#ifndef div64_s64
	110	extern s64 div64_s64(s64 dividend, s64 divisor);
	111	#endif
	112
2418f4f2 RZ	113	#endif /* BITS_PER_LONG */
	114
	115	/**
	116	* div_u64 - unsigned 64bit divide with 32bit divisor
078843f7 RD	117	* @dividend: unsigned 64bit dividend
078843f7 RD	118	* @divisor: unsigned 32bit divisor
2418f4f2 RZ	119	*
	120	* This is the most common 64bit divide and should be used if possible,
	121	* as many 32bit archs can optimize this variant better than a full 64bit
	122	* divide.
a898db21 LB	123	*
a898db21 LB	124	* Return: dividend / divisor
2418f4f2 RZ	125	*/
	126	#ifndef div_u64
	127	static inline u64 div_u64(u64 dividend, u32 divisor)
	128	{
	129	u32 remainder;
	130	return div_u64_rem(dividend, divisor, &remainder);
	131	}
	132	#endif
	133
	134	/**
	135	* div_s64 - signed 64bit divide with 32bit divisor
078843f7 RD	136	* @dividend: signed 64bit dividend
078843f7 RD	137	* @divisor: signed 32bit divisor
a898db21 LB	138	*
a898db21 LB	139	* Return: dividend / divisor
2418f4f2 RZ	140	*/
	141	#ifndef div_s64
	142	static inline s64 div_s64(s64 dividend, s32 divisor)
	143	{
	144	s32 remainder;
	145	return div_s64_rem(dividend, divisor, &remainder);
	146	}
	147	#endif
	148
f595ec96 JF	149	u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
f595ec96 JF	150
9e3d6223 PZ	151	#ifndef mul_u32_u32
	152	/*
	153	* Many a GCC version messes this up and generates a 64x64 mult :-(
	154	*/
	155	static inline u64 mul_u32_u32(u32 a, u32 b)
	156	{
	157	return (u64)a * b;
	158	}
	159	#endif
	160
be5e610c PZ	161	#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
	162
	163	#ifndef mul_u64_u32_shr
8739c681	164	static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
be5e610c PZ	165	{
	166	return (u64)(((unsigned __int128)a * mul) >> shift);
	167	}
	168	#endif /* mul_u64_u32_shr */
	169
35181e86 HZ	170	#ifndef mul_u64_u64_shr
	171	static inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
	172	{
	173	return (u64)(((unsigned __int128)a * mul) >> shift);
	174	}
	175	#endif /* mul_u64_u64_shr */
	176
be5e610c PZ	177	#else
	178
	179	#ifndef mul_u64_u32_shr
8739c681	180	static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
be5e610c PZ	181	{
	182	u32 ah, al;
	183	u64 ret;
	184
	185	al = a;
	186	ah = a >> 32;
	187
9e3d6223	188	ret = mul_u32_u32(al, mul) >> shift;
be5e610c	189	if (ah)
9e3d6223	190	ret += mul_u32_u32(ah, mul) << (32 - shift);
be5e610c PZ	191
	192	return ret;
	193	}
	194	#endif /* mul_u64_u32_shr */
	195
35181e86 HZ	196	#ifndef mul_u64_u64_shr
	197	static inline u64 mul_u64_u64_shr(u64 a, u64 b, unsigned int shift)
	198	{
	199	union {
	200	u64 ll;
	201	struct {
	202	#ifdef __BIG_ENDIAN
	203	u32 high, low;
	204	#else
	205	u32 low, high;
	206	#endif
	207	} l;
	208	} rl, rm, rn, rh, a0, b0;
	209	u64 c;
	210
	211	a0.ll = a;
	212	b0.ll = b;
	213
9e3d6223 PZ	214	rl.ll = mul_u32_u32(a0.l.low, b0.l.low);
	215	rm.ll = mul_u32_u32(a0.l.low, b0.l.high);
	216	rn.ll = mul_u32_u32(a0.l.high, b0.l.low);
	217	rh.ll = mul_u32_u32(a0.l.high, b0.l.high);
35181e86 HZ	218
	219	/*
	220	* Each of these lines computes a 64-bit intermediate result into "c",
	221	* starting at bits 32-95. The low 32-bits go into the result of the
	222	* multiplication, the high 32-bits are carried into the next step.
	223	*/
	224	rl.l.high = c = (u64)rl.l.high + rm.l.low + rn.l.low;
	225	rh.l.low = c = (c >> 32) + rm.l.high + rn.l.high + rh.l.low;
	226	rh.l.high = (c >> 32) + rh.l.high;
	227
	228	/*
	229	* The 128-bit result of the multiplication is in rl.ll and rh.ll,
	230	* shift it right and throw away the high part of the result.
	231	*/
	232	if (shift == 0)
	233	return rl.ll;
	234	if (shift < 64)
	235	return (rl.ll >> shift) \| (rh.ll << (64 - shift));
	236	return rh.ll >> (shift & 63);
	237	}
	238	#endif /* mul_u64_u64_shr */
	239
be5e610c PZ	240	#endif
be5e610c PZ	241
605a140a IS	242	#ifndef mul_s64_u64_shr
	243	static inline u64 mul_s64_u64_shr(s64 a, u64 b, unsigned int shift)
	244	{
	245	u64 ret;
	246
	247	/*
	248	* Extract the sign before the multiplication and put it back
	249	* afterwards if needed.
	250	*/
	251	ret = mul_u64_u64_shr(abs(a), b, shift);
	252
	253	if (a < 0)
	254	ret = -((s64) ret);
	255
	256	return ret;
	257	}
	258	#endif /* mul_s64_u64_shr */
	259
381d585c HZ	260	#ifndef mul_u64_u32_div
	261	static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
	262	{
	263	union {
	264	u64 ll;
	265	struct {
	266	#ifdef __BIG_ENDIAN
	267	u32 high, low;
	268	#else
	269	u32 low, high;
	270	#endif
	271	} l;
	272	} u, rl, rh;
	273
	274	u.ll = a;
9e3d6223 PZ	275	rl.ll = mul_u32_u32(u.l.low, mul);
9e3d6223 PZ	276	rh.ll = mul_u32_u32(u.l.high, mul) + rl.l.high;
381d585c HZ	277
	278	/* Bits 32-63 of the result will be in rh.l.low. */
	279	rl.l.high = do_div(rh.ll, divisor);
	280
	281	/* Bits 0-31 of the result will be in rl.l.low. */
	282	do_div(rl.ll, divisor);
	283
	284	rl.l.high = rh.l.low;
	285	return rl.ll;
	286	}
	287	#endif /* mul_u64_u32_div */
	288
3dc167ba ON	289	u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div);
3dc167ba ON	290
090f13ca LB	291	/**
	292	* DIV64_U64_ROUND_UP - unsigned 64bit divide with 64bit divisor rounded up
	293	* @ll: unsigned 64bit dividend
	294	* @d: unsigned 64bit divisor
	295	*
	296	* Divide unsigned 64bit dividend by unsigned 64bit divisor
	297	* and round up.
	298	*
	299	* Return: dividend / divisor rounded up
	300	*/
68600f62 RG	301	#define DIV64_U64_ROUND_UP(ll, d) \
	302	({ u64 _tmp = (d); div64_u64((ll) + _tmp - 1, _tmp); })
	303
cb8be119 SH	304	/**
	305	* DIV64_U64_ROUND_CLOSEST - unsigned 64bit divide with 64bit divisor rounded to nearest integer
	306	* @dividend: unsigned 64bit dividend
	307	* @divisor: unsigned 64bit divisor
	308	*
	309	* Divide unsigned 64bit dividend by unsigned 64bit divisor
	310	* and round to closest integer.
	311	*
	312	* Return: dividend / divisor rounded to nearest integer
	313	*/
	314	#define DIV64_U64_ROUND_CLOSEST(dividend, divisor) \
	315	({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); })
	316
d28a1de5	317	/**
2c861b73 PR	318	* DIV_U64_ROUND_CLOSEST - unsigned 64bit divide with 32bit divisor rounded to nearest integer
	319	* @dividend: unsigned 64bit dividend
	320	* @divisor: unsigned 32bit divisor
	321	*
	322	* Divide unsigned 64bit dividend by unsigned 32bit divisor
	323	* and round to closest integer.
	324	*
	325	* Return: dividend / divisor rounded to nearest integer
	326	*/
	327	#define DIV_U64_ROUND_CLOSEST(dividend, divisor) \
	328	({ u32 _tmp = (divisor); div_u64((u64)(dividend) + _tmp / 2, _tmp); })
	329
d28a1de5	330	/**
af60459a CZ	331	* DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer
	332	* @dividend: signed 64bit dividend
	333	* @divisor: signed 32bit divisor
	334	*
	335	* Divide signed 64bit dividend by signed 32bit divisor
	336	* and round to closest integer.
	337	*
	338	* Return: dividend / divisor rounded to nearest integer
	339	*/
	340	#define DIV_S64_ROUND_CLOSEST(dividend, divisor)( \
	341	{ \
	342	s64 __x = (dividend); \
	343	s32 __d = (divisor); \
	344	((__x > 0) == (__d > 0)) ? \
	345	div_s64((__x + (__d / 2)), __d) : \
	346	div_s64((__x - (__d / 2)), __d); \
	347	} \
	348	)
2418f4f2	349	#endif /* _LINUX_MATH64_H */