module: Make module_enable_ro() static again

Now that module_enable_ro() has no more external users, make it static
again.
Suggested-by: NJessica Yu <jeyu@kernel.org>
Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Acked-by: NJessica Yu <jeyu@kernel.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

include/linux/module.h

@@ -858,12 +858,6 @@ extern int module_sysfs_initialized;
 
 #define __MODULE_STRING(x) __stringify(x)
 
-#ifdef CONFIG_STRICT_MODULE_RWX
-extern void module_enable_ro(const struct module *mod, bool after_init);
-#else
-static inline void module_enable_ro(const struct module *mod, bool after_init) { }
-#endif
-
 #ifdef CONFIG_GENERIC_BUG
 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 			 struct module *);

kernel/module.c

@@ -1997,7 +1997,7 @@ static void frob_writable_data(const struct module_layout *layout,
 		   (layout->size - layout->ro_after_init_size) >> PAGE_SHIFT);
 }
 
-void module_enable_ro(const struct module *mod, bool after_init)
+static void module_enable_ro(const struct module *mod, bool after_init)
 {
 	if (!rodata_enabled)
 		return;
@@ -2025,6 +2025,7 @@ static void module_enable_nx(const struct module *mod)
 
 #else /* !CONFIG_STRICT_MODULE_RWX */
 static void module_enable_nx(const struct module *mod) { }
+static void module_enable_ro(const struct module *mod, bool after_init) {}
 #endif /*  CONFIG_STRICT_MODULE_RWX */
 static void module_enable_x(const struct module *mod)
 {