linux-kernel - [PATCH] modules: Fix build error in moduleloader.h

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Date:	Thu, 3 Jul 2014 09:21:21 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: [PATCH] modules: Fix build error in moduleloader.h

Fengguang Wu's build bot detected that if moduleloader.h is included in
a C file (used by ftrace and kprobes to access module_alloc() when
available), that it can fail to build if CONFIG_MODULES and
CONFIG_MODULES_USE_ELF_REL is not defined.

This is because there's a printk() that dereferences struct module to
print the name of the module. But as struct module does not exist when
CONFIG_MODULES is not defined we get this error:

   include/linux/moduleloader.h: In function 'apply_relocate':
>> include/linux/moduleloader.h:48:63: error: dereferencing pointer to incomplete type  
     printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
                                                                  ^
Avoid the printk if CONFIG_MODULES is not set.

Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h
index 560ca53..d9da807 100644
--- a/include/linux/moduleloader.h
+++ b/include/linux/moduleloader.h
@@ -45,7 +45,10 @@ static inline int apply_relocate(Elf_Shdr *sechdrs,
 				 unsigned int relsec,
 				 struct module *me)
 {
+/* me->name only exists if modules are enabled */
+#ifdef CONFIG_MODULES
 	printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
+#endif
 	return -ENOEXEC;
 }
 #endif
--
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