[mirror_ubuntu-bionic-kernel.git] / arch / alpha / include / asm / local.h

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

#include <linux/percpu.h>
#include <linux/atomic.h>

typedef struct
{
	atomic_long_t a;
} local_t;

#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }
#define local_read(l)	atomic_long_read(&(l)->a)
#define local_set(l,i)	atomic_long_set(&(l)->a, (i))
#define local_inc(l)	atomic_long_inc(&(l)->a)
#define local_dec(l)	atomic_long_dec(&(l)->a)
#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))

static __inline__ long local_add_return(long i, local_t * l)
{
	long temp, result;
	__asm__ __volatile__(
	"1:	ldq_l %0,%1\n"
	"	addq %0,%3,%2\n"
	"	addq %0,%3,%0\n"
	"	stq_c %0,%1\n"
	"	beq %0,2f\n"
	".subsection 2\n"
	"2:	br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
	:"Ir" (i), "m" (l->a.counter) : "memory");
	return result;
}

static __inline__ long local_sub_return(long i, local_t * l)
{
	long temp, result;
	__asm__ __volatile__(
	"1:	ldq_l %0,%1\n"
	"	subq %0,%3,%2\n"
	"	subq %0,%3,%0\n"
	"	stq_c %0,%1\n"
	"	beq %0,2f\n"
	".subsection 2\n"
	"2:	br 1b\n"
	".previous"
	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
	:"Ir" (i), "m" (l->a.counter) : "memory");
	return result;
}

#define local_cmpxchg(l, o, n) \
	(cmpxchg_local(&((l)->a.counter), (o), (n)))
#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))

/**
 * local_add_unless - add unless the number is a given value
 * @l: pointer of type local_t
 * @a: the amount to add to l...
 * @u: ...unless l is equal to u.
 *
 * Atomically adds @a to @l, so long as it was not @u.
 * Returns non-zero if @l was not @u, and zero otherwise.
 */
#define local_add_unless(l, a, u)				\
({								\
	long c, old;						\
	c = local_read(l);					\
	for (;;) {						\
		if (unlikely(c == (u)))				\
			break;					\
		old = local_cmpxchg((l), c, c + (a));	\
		if (likely(old == c))				\
			break;					\
		c = old;					\
	}							\
	c != (u);						\
})
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)

#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)

#define local_dec_return(l) local_sub_return(1,(l))

#define local_inc_return(l) local_add_return(1,(l))

#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)

#define local_inc_and_test(l) (local_add_return(1, (l)) == 0)

#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)

/* Verify if faster than atomic ops */
#define __local_inc(l)		((l)->a.counter++)
#define __local_dec(l)		((l)->a.counter++)
#define __local_add(i,l)	((l)->a.counter+=(i))
#define __local_sub(i,l)	((l)->a.counter-=(i))

#endif /* _ALPHA_LOCAL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _ALPHA_LOCAL_H
	3	#define _ALPHA_LOCAL_H
	4
	5	#include <linux/percpu.h>
60063497	6	#include <linux/atomic.h>
1da177e4	7
f43f7b46 MD	8	typedef struct
	9	{
	10	atomic_long_t a;
	11	} local_t;
1da177e4	12
f43f7b46 MD	13	#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
	14	#define local_read(l) atomic_long_read(&(l)->a)
	15	#define local_set(l,i) atomic_long_set(&(l)->a, (i))
	16	#define local_inc(l) atomic_long_inc(&(l)->a)
	17	#define local_dec(l) atomic_long_dec(&(l)->a)
	18	#define local_add(i,l) atomic_long_add((i),(&(l)->a))
	19	#define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
1da177e4	20
f43f7b46 MD	21	static __inline__ long local_add_return(long i, local_t * l)
	22	{
	23	long temp, result;
	24	__asm__ __volatile__(
	25	"1: ldq_l %0,%1\n"
	26	" addq %0,%3,%2\n"
	27	" addq %0,%3,%0\n"
	28	" stq_c %0,%1\n"
	29	" beq %0,2f\n"
	30	".subsection 2\n"
	31	"2: br 1b\n"
	32	".previous"
	33	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
	34	:"Ir" (i), "m" (l->a.counter) : "memory");
	35	return result;
	36	}
1da177e4	37
f43f7b46 MD	38	static __inline__ long local_sub_return(long i, local_t * l)
	39	{
	40	long temp, result;
	41	__asm__ __volatile__(
	42	"1: ldq_l %0,%1\n"
	43	" subq %0,%3,%2\n"
	44	" subq %0,%3,%0\n"
	45	" stq_c %0,%1\n"
	46	" beq %0,2f\n"
	47	".subsection 2\n"
	48	"2: br 1b\n"
	49	".previous"
	50	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
	51	:"Ir" (i), "m" (l->a.counter) : "memory");
	52	return result;
	53	}
	54
	55	#define local_cmpxchg(l, o, n) \
	56	(cmpxchg_local(&((l)->a.counter), (o), (n)))
	57	#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
	58
	59	/**
	60	* local_add_unless - add unless the number is a given value
	61	* @l: pointer of type local_t
	62	* @a: the amount to add to l...
	63	* @u: ...unless l is equal to u.
	64	*
	65	* Atomically adds @a to @l, so long as it was not @u.
	66	* Returns non-zero if @l was not @u, and zero otherwise.
	67	*/
	68	#define local_add_unless(l, a, u) \
	69	({ \
	70	long c, old; \
	71	c = local_read(l); \
	72	for (;;) { \
	73	if (unlikely(c == (u))) \
	74	break; \
	75	old = local_cmpxchg((l), c, c + (a)); \
	76	if (likely(old == c)) \
	77	break; \
	78	c = old; \
	79	} \
	80	c != (u); \
	81	})
	82	#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
	83
	84	#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
	85
	86	#define local_dec_return(l) local_sub_return(1,(l))
	87
	88	#define local_inc_return(l) local_add_return(1,(l))
	89
	90	#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
	91
	92	#define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
	93
	94	#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
	95
	96	/* Verify if faster than atomic ops */
	97	#define __local_inc(l) ((l)->a.counter++)
	98	#define __local_dec(l) ((l)->a.counter++)
	99	#define __local_add(i,l) ((l)->a.counter+=(i))
	100	#define __local_sub(i,l) ((l)->a.counter-=(i))
1da177e4	101
1da177e4	102	#endif /* _ALPHA_LOCAL_H */