atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency

atomic_add_unless as inline. Remove system.h atomic.h circular dependency.
I agree (with Andi Kleen) this typeof is not needed and more error
prone. All the original atomic.h code that uses cmpxchg (which includes
the atomic_add_unless) uses defines instead of inline functions,
probably to circumvent a circular dependency between system.h and
atomic.h on powerpc (which my patch addresses). Therefore, it makes
sense to use inline functions that will provide type checking.

atomic_add_unless as inline. Remove system.h atomic.h circular dependency.
Digging into the FRV architecture shows me that it is also affected by
such a circular dependency. Here is the diff applying this against the
rest of my atomic.h patches.

It applies over the atomic.h standardization patches.

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

1 files changed, 31 insertions, 28 deletions

diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index c3feb3af2cfe..3fb4e1f7f186 100644
--- a/include/asm-sparc64/atomic.h
+++ b/include/asm-sparc64/atomic.h
@@ -9,6 +9,7 @@
 #define __ARCH_SPARC64_ATOMIC__
 
 #include <linux/types.h>
+#include <asm/system.h>
 
 typedef struct { volatile int counter; } atomic_t;
 typedef struct { volatile __s64 counter; } atomic64_t;
@@ -73,40 +74,42 @@ extern int atomic64_sub_ret(int, atomic64_t *);
 #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)                              \
-({                                                              \
-        __typeof__((v)->counter) c, old;                        \
-        c = atomic_read(v);                                     \
-        for (;;) {                                              \
-                if (unlikely(c == (u)))                         \
-                        break;                                  \
-                old = atomic_cmpxchg((v), c, c + (a));          \
-                if (likely(old == c))                           \
-                        break;                                  \
-                c = old;                                        \
-        }                                                       \
-        likely(c != (u));                                       \
-})
+static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+{
+        int c, old;
+        c = atomic_read(v);
+        for (;;) {
+                if (unlikely(c == (u)))
+                        break;
+                old = atomic_cmpxchg((v), c, c + (a));
+                if (likely(old == c))
+                        break;
+                c = old;
+        }
+        return c != (u);
+}
+
 #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));                                       \
-})
+static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
+{
+        long 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;
+        }
+        return c != (u);
+}
+
 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
 
 /* Atomic operations are already serializing */