70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
#include <common/Common.h>
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#include <asm/atomic.h> // also adds ATOMIC64_INIT if available
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#ifndef ATOMIC64_INIT // basic test if the kernel already provides atomic64_t
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/*
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* Note: Below is the atomic64.c copied from linux-git
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*/
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/*
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* Generic implementation of 64-bit atomics using spinlocks,
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* useful on processors that don't have 64-bit atomic instructions.
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*
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* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_GENERIC_ATOMIC64_H
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#define _ASM_GENERIC_ATOMIC64_H
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typedef struct {
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long long counter;
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spinlock_t lock; // added for fhgfs
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} atomic64_t;
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// #define ATOMIC64_INIT(i) { (i) } // disabled for fhgfs
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static inline void atomic_init(atomic64_t *atomic, uint64_t value); // added for fhgfs
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extern long long atomic64_read(const atomic64_t *v);
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extern void atomic64_set(atomic64_t *v, long long i);
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extern void atomic64_add(long long a, atomic64_t *v);
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extern long long atomic64_add_return(long long a, atomic64_t *v);
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extern void atomic64_sub(long long a, atomic64_t *v);
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extern long long atomic64_sub_return(long long a, atomic64_t *v);
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extern long long atomic64_dec_if_positive(atomic64_t *v);
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extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
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extern long long atomic64_xchg(atomic64_t *v, long long new);
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extern int atomic64_add_unless(atomic64_t *v, long long a, long long u);
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#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
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#define atomic64_inc(v) atomic64_add(1LL, (v))
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#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
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#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
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#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
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#define atomic64_dec(v) atomic64_sub(1LL, (v))
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#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v))
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#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
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#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
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/*
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* Initializer for fhgfs, replacement for ATOMIC64_INIT(i)
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*/
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void atomic_init(atomic64_t* atomic, uint64_t value)
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{
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spin_lock_init(&atomic->lock);
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atomic->counter = value;
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}
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#endif /* _ASM_GENERIC_ATOMIC64_H */
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#endif // #ifndef ATOMIC64_INIT
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