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

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Acked-by: Grant Grundler <grundler@parisc-linux.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-parisc/atomic.h b/include/asm-parisc/atomic.h
index 7d57d34fcca8..66a0edbb51f4 100644
--- a/include/asm-parisc/atomic.h
+++ b/include/asm-parisc/atomic.h
@@ -6,7 +6,6 @@
 #define _ASM_PARISC_ATOMIC_H_
 
 #include <linux/types.h>
-#include <asm/system.h>
 
 /*
  * Atomic operations that C can't guarantee us.  Useful for
@@ -163,7 +162,7 @@ static __inline__ int atomic_read(const atomic_t *v)
 }
 
 /* exported interface */
-#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))
 
 /**
@@ -177,7 +176,7 @@ static __inline__ int atomic_read(const 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;                                        \
@@ -270,6 +269,30 @@ atomic64_read(const atomic64_t *v)
 #define atomic64_dec_and_test(v)        (atomic64_dec_return(v) == 0)
 #define atomic64_sub_and_test(i,v)      (atomic64_sub_return((i),(v)) == 0)
 
+/* exported interface */
+#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 = atomic64_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)
+
 #endif /* CONFIG_64BIT */
 
 #include <asm-generic/atomic.h>