linux-kernel - [PATCH] param: add null statement to compiled-in module params

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Date:	Wed,  5 Jan 2011 13:27:04 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Rusty Russell <rusty@...tcorp.com.au>, linux-kernel@...r.kernel.org
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Dan Carpenter <error27@...il.com>
Subject: [PATCH] param: add null statement to compiled-in module params

Add an unused struct declaration statement requiring a
terminating semicolon to the compile-in case to provoke an
error if __MODULE_INFO() is used without the terminating
semicolon. Previously MODULE_ALIAS("foo") (no semicolon)
compiled fine if MODULE was not selected.

Cc: Dan Carpenter <error27@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
More clever solutions appreciated, this thing works.
---
 include/linux/moduleparam.h |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 112adf8..07b4195 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -16,15 +16,17 @@
 /* Chosen so that structs with an unsigned long line up. */
 #define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
 
-#ifdef MODULE
 #define ___module_cat(a,b) __mod_ ## a ## b
 #define __module_cat(a,b) ___module_cat(a,b)
+#ifdef MODULE
 #define __MODULE_INFO(tag, name, info)					  \
 static const char __module_cat(name,__LINE__)[]				  \
   __used __attribute__((section(".modinfo"), unused, aligned(1)))	  \
   = __stringify(tag) "=" info
 #else  /* !MODULE */
-#define __MODULE_INFO(tag, name, info)
+/* This struct is here for syntactic coherency, it is not used */
+#define __MODULE_INFO(tag, name, info)					  \
+  struct __module_cat(name,__LINE__) {}
 #endif
 #define __MODULE_PARM_TYPE(name, _type)					  \
   __MODULE_INFO(parmtype, name##type, #name ":" _type)
-- 
1.7.3.4

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