ubifs: Import atomic_long operations from Linux

This commit is a preperation for a subsequent UBIFS commit
which needs atomic_long operations.

Therefor "include/asm-generic/atomic-long.h" is imported
from 1860e37 Linux 3.15

Signed-off-by: Anton Habegger <anton.habegger@gmail.com>

2 files changed, 260 insertions, 1 deletions

diff --git a/include/asm-generic/atomic-long.h b/include/asm-generic/atomic-long.h
new file mode 100644
index 0000000..d0469ef
--- /dev/null
+++ b/include/asm-generic/atomic-long.h
@@ -0,0 +1,260 @@
+#ifndef _ASM_GENERIC_ATOMIC_LONG_H
+#define _ASM_GENERIC_ATOMIC_LONG_H
+/*
+ * Copyright (C) 2005 Silicon Graphics, Inc.
+ *	Christoph Lameter
+ *
+ * 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);
+}
+
+static inline int atomic_long_sub_and_test(long i, atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return atomic64_sub_and_test(i, v);
+}
+
+static inline int atomic_long_dec_and_test(atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return atomic64_dec_and_test(v);
+}
+
+static inline int atomic_long_inc_and_test(atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return atomic64_inc_and_test(v);
+}
+
+static inline int atomic_long_add_negative(long i, atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return atomic64_add_negative(i, v);
+}
+
+static inline long atomic_long_add_return(long i, atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return (long)atomic64_add_return(i, v);
+}
+
+static inline long atomic_long_sub_return(long i, atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return (long)atomic64_sub_return(i, v);
+}
+
+static inline long atomic_long_inc_return(atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return (long)atomic64_inc_return(v);
+}
+
+static inline long atomic_long_dec_return(atomic_long_t *l)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return (long)atomic64_dec_return(v);
+}
+
+static inline long atomic_long_add_unless(atomic_long_t *l, long a, long u)
+{
+	atomic64_t *v = (atomic64_t *)l;
+
+	return (long)atomic64_add_unless(v, a, u);
+}
+
+#define atomic_long_inc_not_zero(l) atomic64_inc_not_zero((atomic64_t *)(l))
+
+#define atomic_long_cmpxchg(l, old, new) \
+	(atomic64_cmpxchg((atomic64_t *)(l), (old), (new)))
+#define atomic_long_xchg(v, new) \
+	(atomic64_xchg((atomic64_t *)(v), (new)))
+
+#else  /*  BITS_PER_LONG == 64  */
+
+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);
+}
+
+#ifndef __UBOOT__
+static inline int atomic_long_sub_and_test(long i, atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return atomic_sub_and_test(i, v);
+}
+
+static inline int atomic_long_dec_and_test(atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return atomic_dec_and_test(v);
+}
+
+static inline int atomic_long_inc_and_test(atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return atomic_inc_and_test(v);
+}
+
+static inline int atomic_long_add_negative(long i, atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return atomic_add_negative(i, v);
+}
+
+static inline long atomic_long_add_return(long i, atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return (long)atomic_add_return(i, v);
+}
+
+static inline long atomic_long_sub_return(long i, atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return (long)atomic_sub_return(i, v);
+}
+
+static inline long atomic_long_inc_return(atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return (long)atomic_inc_return(v);
+}
+
+static inline long atomic_long_dec_return(atomic_long_t *l)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return (long)atomic_dec_return(v);
+}
+
+static inline long atomic_long_add_unless(atomic_long_t *l, long a, long u)
+{
+	atomic_t *v = (atomic_t *)l;
+
+	return (long)atomic_add_unless(v, a, u);
+}
+
+#define atomic_long_inc_not_zero(l) atomic_inc_not_zero((atomic_t *)(l))
+
+#define atomic_long_cmpxchg(l, old, new) \
+	(atomic_cmpxchg((atomic_t *)(l), (old), (new)))
+#define atomic_long_xchg(v, new) \
+	(atomic_xchg((atomic_t *)(v), (new)))
+#endif  /*  __UBOOT__ */
+
+#endif  /*  BITS_PER_LONG == 64  */
+
+#endif  /*  _ASM_GENERIC_ATOMIC_LONG_H  */
diff --git a/include/linux/compat.h b/include/linux/compat.h
index b40133c..6eac17f 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -262,7 +262,6 @@ typedef struct {
 
 /* from include/linux/types.h */
 
-typedef int	atomic_t;
 /**
  * struct callback_head - callback structure for use with RCU and task_work
  * @next: next update requests in a list