locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
Implement FETCH-OP atomic primitives, these are very similar to the existing OP-RETURN primitives we already have, except they return the value of the atomic variable _before_ modification. This is especially useful for irreversible operations -- such as bitops (because it becomes impossible to reconstruct the state prior to modification). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: James Y Knight <jyknight@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: sparclinux@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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committed by
Ingo Molnar

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7d9794e752
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@@ -5,4 +5,5 @@
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#else
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#include <asm/atomic_32.h>
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#endif
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#define atomic_fetch_or atomic_fetch_or
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#endif
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@@ -20,9 +20,10 @@
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#define ATOMIC_INIT(i) { (i) }
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int atomic_add_return(int, atomic_t *);
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void atomic_and(int, atomic_t *);
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void atomic_or(int, atomic_t *);
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void atomic_xor(int, atomic_t *);
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int atomic_fetch_add(int, atomic_t *);
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int atomic_fetch_and(int, atomic_t *);
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int atomic_fetch_or(int, atomic_t *);
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int atomic_fetch_xor(int, atomic_t *);
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int atomic_cmpxchg(atomic_t *, int, int);
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int atomic_xchg(atomic_t *, int);
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int __atomic_add_unless(atomic_t *, int, int);
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@@ -35,7 +36,15 @@ void atomic_set(atomic_t *, int);
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#define atomic_inc(v) ((void)atomic_add_return( 1, (v)))
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#define atomic_dec(v) ((void)atomic_add_return( -1, (v)))
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#define atomic_fetch_or atomic_fetch_or
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#define atomic_and(i, v) ((void)atomic_fetch_and((i), (v)))
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#define atomic_or(i, v) ((void)atomic_fetch_or((i), (v)))
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#define atomic_xor(i, v) ((void)atomic_fetch_xor((i), (v)))
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#define atomic_sub_return(i, v) (atomic_add_return(-(int)(i), (v)))
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#define atomic_fetch_sub(i, v) (atomic_fetch_add (-(int)(i), (v)))
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#define atomic_inc_return(v) (atomic_add_return( 1, (v)))
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#define atomic_dec_return(v) (atomic_add_return( -1, (v)))
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@@ -28,16 +28,24 @@ void atomic64_##op(long, atomic64_t *);
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int atomic_##op##_return(int, atomic_t *); \
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long atomic64_##op##_return(long, atomic64_t *);
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#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
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#define ATOMIC_FETCH_OP(op) \
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int atomic_fetch_##op(int, atomic_t *); \
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long atomic64_fetch_##op(long, atomic64_t *);
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#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
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ATOMIC_OPS(add)
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ATOMIC_OPS(sub)
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ATOMIC_OP(and)
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ATOMIC_OP(or)
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ATOMIC_OP(xor)
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#undef ATOMIC_OPS
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#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
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ATOMIC_OPS(and)
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ATOMIC_OPS(or)
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ATOMIC_OPS(xor)
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#undef ATOMIC_OPS
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#undef ATOMIC_FETCH_OP
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#undef ATOMIC_OP_RETURN
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#undef ATOMIC_OP
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