1 files changed, 117 insertions, 0 deletions

diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
new file mode 100644
index 000000000000..42a95d9a0641
--- /dev/null
+++ b/include/asm-generic/atomic.h
@@ -0,0 +1,117 @@
+#ifndef _ASM_GENERIC_ATOMIC_H
+#define _ASM_GENERIC_ATOMIC_H
+/*
+ * Copyright (C) 2005 Silicon Graphics, Inc.
+ *      Christoph Lameter <clameter@sgi.com>
+ *
+ * Allows to provide arch independent atomic definitions without the need to
+ * edit all arch specific atomic.h files.
+ */
+
+#include <asm/types.h>
+
+/*
+ * Suppport for atomic_long_t
+ *
+ * Casts for parameters are avoided for existing atomic functions in order to
+ * avoid issues with cast-as-lval under gcc 4.x and other limitations that the
+ * macros of a platform may have.
+ */
+
+#if BITS_PER_LONG == 64
+
+typedef atomic64_t atomic_long_t;
+
+#define ATOMIC_LONG_INIT(i)     ATOMIC64_INIT(i)
+
+static inline long atomic_long_read(atomic_long_t *l)
+{
+        atomic64_t *v = (atomic64_t *)l;
+
+        return (long)atomic64_read(v);
+}
+
+static inline void atomic_long_set(atomic_long_t *l, long i)
+{
+        atomic64_t *v = (atomic64_t *)l;
+
+        atomic64_set(v, i);
+}
+
+static inline void atomic_long_inc(atomic_long_t *l)
+{
+        atomic64_t *v = (atomic64_t *)l;
+
+        atomic64_inc(v);
+}
+
+static inline void atomic_long_dec(atomic_long_t *l)
+{
+        atomic64_t *v = (atomic64_t *)l;
+
+        atomic64_dec(v);
+}
+
+static inline void atomic_long_add(long i, atomic_long_t *l)
+{
+        atomic64_t *v = (atomic64_t *)l;
+
+        atomic64_add(i, v);
+}
+
+static inline void atomic_long_sub(long i, atomic_long_t *l)
+{
+        atomic64_t *v = (atomic64_t *)l;
+
+        atomic64_sub(i, v);
+}
+
+#else
+
+typedef atomic_t atomic_long_t;
+
+#define ATOMIC_LONG_INIT(i)     ATOMIC_INIT(i)
+static inline long atomic_long_read(atomic_long_t *l)
+{
+        atomic_t *v = (atomic_t *)l;
+
+        return (long)atomic_read(v);
+}
+
+static inline void atomic_long_set(atomic_long_t *l, long i)
+{
+        atomic_t *v = (atomic_t *)l;
+
+        atomic_set(v, i);
+}
+
+static inline void atomic_long_inc(atomic_long_t *l)
+{
+        atomic_t *v = (atomic_t *)l;
+
+        atomic_inc(v);
+}
+
+static inline void atomic_long_dec(atomic_long_t *l)
+{
+        atomic_t *v = (atomic_t *)l;
+
+        atomic_dec(v);
+}
+
+static inline void atomic_long_add(long i, atomic_long_t *l)
+{
+        atomic_t *v = (atomic_t *)l;
+
+        atomic_add(i, v);
+}
+
+static inline void atomic_long_sub(long i, atomic_long_t *l)
+{
+        atomic_t *v = (atomic_t *)l;
+
+        atomic_sub(i, v);
+}
+
+#endif
+#endif