atomic.h: add atomic64 cmpxchg, xchg and add_unless to mips

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 3 deletions

diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h
index 1ac50b6c47ad..6423ffa195a4 100644
--- a/include/asm-mips/atomic.h
+++ b/include/asm-mips/atomic.h
@@ -306,8 +306,8 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
         return result;
 }
 
-#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
 
 /**
  * atomic_add_unless - add unless the number is a given value
@@ -320,7 +320,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
  */
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
-        int c, old;                                             \
+        __typeof__((v)->counter) c, old;                        \
         c = atomic_read(v);                                     \
         while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
                 c = old;                                        \
@@ -681,6 +681,29 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
         return result;
 }
 
+#define atomic64_cmpxchg(v, o, n) \
+        (((__typeof__((v)->counter)))cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), (new)))
+
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+#define atomic64_add_unless(v, a, u)                            \
+({                                                              \
+        __typeof__((v)->counter) c, old;                        \
+        c = atomic_read(v);                                     \
+        while (c != (u) && (old = atomic64_cmpxchg((v), c, c + (a))) != c) \
+                c = old;                                        \
+        c != (u);                                               \
+})
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
 #define atomic64_dec_return(v) atomic64_sub_return(1,(v))
 #define atomic64_inc_return(v) atomic64_add_return(1,(v))