author: Peter Zijlstra <peterz@infradead.org> 2016-04-18 00:54:38 +0200
committer: Ingo Molnar <mingo@kernel.org> 2016-06-16 10:48:32 +0200
commit: 28aa2bda2211f4327d83b44a4f917b4a061b1c56
parent: e12133324b7daaa176bb687c1eb59e1a6b203da4
Commit Summary:
Diffstat:
1 file changed, 26 insertions, 4 deletions
diff --git a/lib/atomic64.c b/lib/atomic64.c
index 2886ebac6567..53c2d5edc826 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -96,17 +96,41 @@ long long atomic64_##op##_return(long long a, atomic64_t *v) \
} \
EXPORT_SYMBOL(atomic64_##op##_return);
+#define ATOMIC64_FETCH_OP(op, c_op) \
+long long atomic64_fetch_##op(long long a, atomic64_t *v) \
+{ \
+ unsigned long flags; \
+ raw_spinlock_t *lock = lock_addr(v); \
+ long long val; \
+ \
+ raw_spin_lock_irqsave(lock, flags); \
+ val = v->counter; \
+ v->counter c_op a; \
+ raw_spin_unlock_irqrestore(lock, flags); \
+ return val; \
+} \
+EXPORT_SYMBOL(atomic64_fetch_##op);
+
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
- ATOMIC64_OP_RETURN(op, c_op)
+ ATOMIC64_OP_RETURN(op, c_op) \
+ ATOMIC64_FETCH_OP(op, c_op)
ATOMIC64_OPS(add, +=)
ATOMIC64_OPS(sub, -=)
-ATOMIC64_OP(and, &=)
-ATOMIC64_OP(or, |=)
-ATOMIC64_OP(xor, ^=)
#undef ATOMIC64_OPS
+#define ATOMIC64_OPS(op, c_op) \
+ ATOMIC64_OP(op, c_op) \
+ ATOMIC64_OP_RETURN(op, c_op) \
+ ATOMIC64_FETCH_OP(op, c_op)
+
+ATOMIC64_OPS(and, &=)
+ATOMIC64_OPS(or, |=)
+ATOMIC64_OPS(xor, ^=)
+
+#undef ATOMIC64_OPS
+#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP