atomic_t: unify all arch definitions

The atomic_t type cannot currently be used in some header files because it
would create an include loop with asm/atomic.h.  Move the type definition
to linux/types.h to break the loop.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/sh/include/asm/atomic.h b/arch/sh/include/asm/atomic.h
index c043ef0..6327ffb 100644
--- a/arch/sh/include/asm/atomic.h
+++ b/arch/sh/include/asm/atomic.h
@@ -7,16 +7,15 @@
  *
  */
 
-typedef struct { volatile int counter; } atomic_t;
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/system.h>
 
 #define ATOMIC_INIT(i)	( (atomic_t) { (i) } )
 
 #define atomic_read(v)		((v)->counter)
 #define atomic_set(v,i)		((v)->counter = (i))
 
-#include <linux/compiler.h>
-#include <asm/system.h>
-
 #if defined(CONFIG_GUSA_RB)
 #include <asm/atomic-grb.h>
 #elif defined(CONFIG_CPU_SH4A)