atomic.h: add atomic64 cmpxchg, xchg and add_unless to sparc64

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 22 insertions, 2 deletions

diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index 2f0bec26a695..c3feb3af2cfe 100644
--- a/include/asm-sparc64/atomic.h
+++ b/include/asm-sparc64/atomic.h
@@ -70,12 +70,12 @@ extern int atomic64_sub_ret(int, atomic64_t *);
 #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
 #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
 
-#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
-        int c, old;                                             \
+        __typeof__((v)->counter) c, old;                        \
         c = atomic_read(v);                                     \
         for (;;) {                                              \
                 if (unlikely(c == (u)))                         \
@@ -89,6 +89,26 @@ extern int atomic64_sub_ret(int, atomic64_t *);
 })
 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
 
+#define atomic64_cmpxchg(v, o, n) \
+        ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+#define atomic64_add_unless(v, a, u)                            \
+({                                                              \
+        __typeof__((v)->counter) 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;                                        \
+        }                                                       \
+        likely(c != (u));                                       \
+})
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
 /* Atomic operations are already serializing */
 #ifdef CONFIG_SMP
 #define smp_mb__before_atomic_dec()     membar_storeload_loadload();