Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sparc / include / asm / atomic_64.h

diff --git a/kernel/arch/sparc/include/asm/atomic_64.h b/kernel/arch/sparc/include/asm/atomic_64.h
new file mode 100644 (file)
index 0000000..4082749
--- /dev/null
+++ b/kernel/arch/sparc/include/asm/atomic_64.h
@@ -0,0 +1,113 @@
+/* atomic.h: Thankfully the V9 is at least reasonable for this
+ *           stuff.
+ *
+ * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
+ */
+
+#ifndef __ARCH_SPARC64_ATOMIC__
+#define __ARCH_SPARC64_ATOMIC__
+
+#include <linux/types.h>
+#include <asm/cmpxchg.h>
+#include <asm/barrier.h>
+
+#define ATOMIC_INIT(i)         { (i) }
+#define ATOMIC64_INIT(i)       { (i) }
+
+#define atomic_read(v)         ACCESS_ONCE((v)->counter)
+#define atomic64_read(v)       ACCESS_ONCE((v)->counter)
+
+#define atomic_set(v, i)       (((v)->counter) = i)
+#define atomic64_set(v, i)     (((v)->counter) = i)
+
+#define ATOMIC_OP(op)                                                  \
+void atomic_##op(int, atomic_t *);                                     \
+void atomic64_##op(long, atomic64_t *);
+
+#define ATOMIC_OP_RETURN(op)                                           \
+int atomic_##op##_return(int, atomic_t *);                             \
+long atomic64_##op##_return(long, atomic64_t *);
+
+#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
+
+ATOMIC_OPS(add)
+ATOMIC_OPS(sub)
+
+#undef ATOMIC_OPS
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
+
+#define atomic_dec_return(v)   atomic_sub_return(1, v)
+#define atomic64_dec_return(v) atomic64_sub_return(1, v)
+
+#define atomic_inc_return(v)   atomic_add_return(1, v)
+#define atomic64_inc_return(v) atomic64_add_return(1, v)
+
+/*
+ * atomic_inc_and_test - increment and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
+
+#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
+#define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0)
+
+#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
+#define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0)
+
+#define atomic_inc(v) atomic_add(1, v)
+#define atomic64_inc(v) atomic64_add(1, v)
+
+#define atomic_dec(v) atomic_sub(1, v)
+#define atomic64_dec(v) atomic64_sub(1, v)
+
+#define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0)
+#define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0)
+
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
+{
+       int c, old;
+       c = atomic_read(v);
+       for (;;) {
+               if (unlikely(c == (u)))
+                       break;
+               old = atomic_cmpxchg((v), c, c + (a));
+               if (likely(old == c))
+                       break;
+               c = old;
+       }
+       return c;
+}
+
+#define atomic64_cmpxchg(v, o, n) \
+       ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
+{
+       long c, old;
+       c = atomic64_read(v);
+       for (;;) {
+               if (unlikely(c == (u)))
+                       break;
+               old = atomic64_cmpxchg((v), c, c + (a));
+               if (likely(old == c))
+                       break;
+               c = old;
+       }
+       return c != (u);
+}
+
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
+long atomic64_dec_if_positive(atomic64_t *v);
+
+#endif /* !(__ARCH_SPARC64_ATOMIC__) */