linux-kernel - [PATCH v2] module: LLVMLinux: Remove unused function warning from __param

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Date:	Fri,  7 Mar 2014 18:10:23 -0800
From:	behanw@...verseincode.com
To:	khali@...ux-fr.org, rostedt@...dmis.org
Cc:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org, pageexec@...email.hu,
	Mark Charlebois <charlebm@...il.com>,
	Behan Webster <behanw@...verseincode.com>
Subject: [PATCH v2] module: LLVMLinux: Remove unused function warning from __param_check macro

From: Mark Charlebois <charlebm@...il.com>

This code makes a compile time type check that is optimized away. Clang
complains that it generates an unused function.

I believe GCC won't complain for a static inline fuction but would if it
was just a static function.

Adding the unused attribute to the function definition removes the warning.

This code works for both gcc and clang.

Signed-off-by: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Behan Webster <behanw@...verseincode.com>
---
 include/linux/moduleparam.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index c3eb102..7f2a726 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -346,7 +346,7 @@ static inline void destroy_params(const struct kernel_param *params,
 /* The macros to do compile-time type checking stolen from Jakub
    Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
 #define __param_check(name, p, type) \
-	static inline type *__check_##name(void) { return(p); }
+	static inline __always_unused type *__check_##name(void) { return(p); }
 
 extern struct kernel_param_ops param_ops_byte;
 extern int param_set_byte(const char *val, const struct kernel_param *kp);
-- 
1.8.3.2

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