/* SPDX-License-Identifier: GPL-2.0-or-later *//* * Generic implementation of 64-bit atomics using spinlocks, * useful on processors that don't have 64-bit atomic instructions. * * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> */#ifndef _ASM_GENERIC_ATOMIC64_H#define _ASM_GENERIC_ATOMIC64_H#include <linux/types.h> typedef struct {	long long counter;} atomic64_t; #define ATOMIC64_INIT(i)	{ (i) } extern long long atomic64_read(const atomic64_t *v);extern void	 atomic64_set(atomic64_t *v, long long i); #define atomic64_set_release(v, i)	atomic64_set((v), (i)) #define ATOMIC64_OP(op)							\extern void	 atomic64_##op(long long a, atomic64_t *v); #define ATOMIC64_OP_RETURN(op)						\extern long long atomic64_##op##_return(long long a, atomic64_t *v); #define ATOMIC64_FETCH_OP(op)						\extern long long atomic64_fetch_##op(long long a, atomic64_t *v); #define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) ATOMIC64_OPS(add)ATOMIC64_OPS(sub) #undef ATOMIC64_OPS#define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) ATOMIC64_OPS(and)ATOMIC64_OPS(or)ATOMIC64_OPS(xor) #undef ATOMIC64_OPS#undef ATOMIC64_FETCH_OP#undef ATOMIC64_OP_RETURN#undef ATOMIC64_OP extern long long atomic64_dec_if_positive(atomic64_t *v);#define atomic64_dec_if_positive atomic64_dec_if_positiveextern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);extern long long atomic64_xchg(atomic64_t *v, long long new);extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u);#define atomic64_fetch_add_unless atomic64_fetch_add_unless #endif  /*  _ASM_GENERIC_ATOMIC64_H  */