locking/atomic: sh: Use generic_cmpxchg_local for arch_cmpxchg_local()

Use __generic_cmpxchg_local() for arch_cmpxchg_local() implementation
on SH architecture because it does not implement arch_cmpxchg_local().

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: John Paul Adrian Glaubitz <[email protected]>
Link: https://lore.kernel.org/r/169824660459.24340.14614817132696360531.stgit@devnote2
Signed-off-by: John Paul Adrian Glaubitz <[email protected]>

Author: mhiramat

arch/sh/include/asm/cmpxchg.h

@@ -71,4 +71,13 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
 				    (unsigned long)_n_, sizeof(*(ptr))); \
   })
 
+#include <asm-generic/cmpxchg-local.h>
+
+#define arch_cmpxchg_local(ptr, o, n) ({				\
+	(__typeof__(*ptr))__generic_cmpxchg_local((ptr),		\
+						  (unsigned long)(o),	\
+						  (unsigned long)(n),	\
+						  sizeof(*(ptr)));	\
+})
+
 #endif /* __ASM_SH_CMPXCHG_H */