FRV: Do some cleanups

1. frv doesn't support SMP, remove the useless SMP bits.

2. frv has its own alloc_task_struct, so define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
   (I am not sure if frv should use generic alloc_task_struct().)
Signed-off-by: WANG Cong <amwang@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>

arch/frv/Kconfig

@@ -361,7 +361,6 @@ menu "Power management options"
 
 config ARCH_SUSPEND_POSSIBLE
 	def_bool y
-	depends on !SMP
 
 source kernel/power/Kconfig
 endmenu

arch/frv/include/asm/system.h

@@ -45,21 +45,12 @@ do {									\
 #define wmb()			asm volatile ("membar" : : :"memory")
 #define read_barrier_depends()	do { } while (0)
 
-#ifdef CONFIG_SMP
-#define smp_mb()			mb()
-#define smp_rmb()			rmb()
-#define smp_wmb()			wmb()
-#define smp_read_barrier_depends()	read_barrier_depends()
-#define set_mb(var, value) \
-	do { xchg(&var, (value)); } while (0)
-#else
 #define smp_mb()			barrier()
 #define smp_rmb()			barrier()
 #define smp_wmb()			barrier()
 #define smp_read_barrier_depends()	do {} while(0)
 #define set_mb(var, value) \
 	do { var = (value); barrier(); } while (0)
-#endif
 
 extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2)));
 extern void free_initmem(void);

arch/frv/include/asm/thread_info.h

@@ -21,6 +21,8 @@
 
 #define THREAD_SIZE		8192
 
+#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
+
 /*
  * low level task data that entry.S needs immediate access to
  * - this struct should fit entirely inside of one cache line