initconst adjustments

- add .init.rodata to INIT_DATA, and group all initconst flavors
  together
- move strings generated from __setup_param() into .init.rodata
- add .*init.rodata to modpost's sets of init sections
- make modpost warn about references between meminit and cpuinit
  as well as memexit and cpuexit sections (as CPU and memory
  hotplug are independently selectable features)

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/include/linux/init.h b/include/linux/init.h
index 0e06c17..9f70c9f 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -225,7 +225,8 @@
  * obs_kernel_param "array" too far apart in .init.setup.
  */
 #define __setup_param(str, unique_id, fn, early)			\
-	static char __setup_str_##unique_id[] __initdata __aligned(1) = str; \
+	static const char __setup_str_##unique_id[] __initconst	\
+		__aligned(1) = str; \
 	static struct obs_kernel_param __setup_##unique_id	\
 		__used __section(.init.setup)			\
 		__attribute__((aligned((sizeof(long)))))	\