293666b7a1
The kernel always executes in the TSO memory model now, so none of this stuff is necessary any more. With helpful feedback from Nick Piggin. Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/* atomic.h: Thankfully the V9 is at least reasonable for this
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* stuff.
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*
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* Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
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*/
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#ifndef __ARCH_SPARC64_ATOMIC__
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#define __ARCH_SPARC64_ATOMIC__
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#include <linux/types.h>
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#include <asm/system.h>
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typedef struct { volatile int counter; } atomic_t;
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typedef struct { volatile __s64 counter; } atomic64_t;
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#define ATOMIC_INIT(i) { (i) }
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#define ATOMIC64_INIT(i) { (i) }
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#define atomic_read(v) ((v)->counter)
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#define atomic64_read(v) ((v)->counter)
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#define atomic_set(v, i) (((v)->counter) = i)
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#define atomic64_set(v, i) (((v)->counter) = i)
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extern void atomic_add(int, atomic_t *);
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extern void atomic64_add(int, atomic64_t *);
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extern void atomic_sub(int, atomic_t *);
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extern void atomic64_sub(int, atomic64_t *);
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extern int atomic_add_ret(int, atomic_t *);
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extern int atomic64_add_ret(int, atomic64_t *);
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extern int atomic_sub_ret(int, atomic_t *);
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extern int atomic64_sub_ret(int, atomic64_t *);
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#define atomic_dec_return(v) atomic_sub_ret(1, v)
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#define atomic64_dec_return(v) atomic64_sub_ret(1, v)
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#define atomic_inc_return(v) atomic_add_ret(1, v)
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#define atomic64_inc_return(v) atomic64_add_ret(1, v)
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#define atomic_sub_return(i, v) atomic_sub_ret(i, v)
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#define atomic64_sub_return(i, v) atomic64_sub_ret(i, v)
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#define atomic_add_return(i, v) atomic_add_ret(i, v)
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#define atomic64_add_return(i, v) atomic64_add_ret(i, v)
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/*
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* atomic_inc_and_test - increment and test
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
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#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
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#define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0)
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#define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0)
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#define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0)
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#define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0)
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#define atomic_inc(v) atomic_add(1, v)
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#define atomic64_inc(v) atomic64_add(1, v)
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#define atomic_dec(v) atomic_sub(1, v)
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#define atomic64_dec(v) atomic64_sub(1, v)
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#define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
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#define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
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#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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static inline int atomic_add_unless(atomic_t *v, int a, int u)
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{
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int c, old;
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c = atomic_read(v);
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for (;;) {
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if (unlikely(c == (u)))
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break;
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old = atomic_cmpxchg((v), c, c + (a));
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if (likely(old == c))
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break;
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c = old;
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}
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return c != (u);
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}
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#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
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#define atomic64_cmpxchg(v, o, n) \
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((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
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#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
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static inline int atomic64_add_unless(atomic64_t *v, long a, long u)
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{
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long c, old;
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c = atomic64_read(v);
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for (;;) {
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if (unlikely(c == (u)))
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break;
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old = atomic64_cmpxchg((v), c, c + (a));
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if (likely(old == c))
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break;
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c = old;
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}
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return c != (u);
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}
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#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
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/* Atomic operations are already serializing */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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#define smp_mb__before_atomic_inc() barrier()
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#define smp_mb__after_atomic_inc() barrier()
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#include <asm-generic/atomic.h>
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#endif /* !(__ARCH_SPARC64_ATOMIC__) */
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