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>

diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index 2f0bec26a695df90ec4fee0c07935ec4a3c0f0de..c3feb3af2cfe2e453f310ab6645c6ad15a2ec73f 100644 (file)
--- 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();