Release 4.14 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;
}

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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;
}

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#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 */
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Directory: arch/alpha/include/asm

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