[PATCH] m68k: fix cmpxchg compile errors if CONFIG_RMW_INSNS=n

We require that all archs implement atomic_cmpxchg(), for the generic
version of atomic_add_unless().

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 32 insertions, 3 deletions

diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h
index a4a84d5c65d..862e497c264 100644
--- a/include/asm-m68k/atomic.h
+++ b/include/asm-m68k/atomic.h
@@ -55,6 +55,7 @@ static inline int atomic_inc_and_test(atomic_t *v)
 }
 
 #ifdef CONFIG_RMW_INSNS
+
 static inline int atomic_add_return(int i, atomic_t *v)
 {
         int t, tmp;
@@ -82,7 +83,12 @@ static inline int atomic_sub_return(int i, atomic_t *v)
                         : "g" (i), "2" (atomic_read(v)));
         return t;
 }
+
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 #else /* !CONFIG_RMW_INSNS */
+
 static inline int atomic_add_return(int i, atomic_t * v)
 {
         unsigned long flags;
@@ -110,6 +116,32 @@ static inline int atomic_sub_return(int i, atomic_t * v)
 
         return t;
 }
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+        unsigned long flags;
+        int prev;
+
+        local_irq_save(flags);
+        prev = atomic_read(v);
+        if (prev == old)
+                atomic_set(v, new);
+        local_irq_restore(flags);
+        return prev;
+}
+
+static inline int atomic_xchg(atomic_t *v, int new)
+{
+        unsigned long flags;
+        int prev;
+
+        local_irq_save(flags);
+        prev = atomic_read(v);
+        atomic_set(v, new);
+        local_irq_restore(flags);
+        return prev;
+}
+
 #endif /* !CONFIG_RMW_INSNS */
 
 #define atomic_dec_return(v)    atomic_sub_return(1, (v))
@@ -139,9 +171,6 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
         __asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
 }
 
-#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
         int c, old;                                             \