From 0283f9a529c81e64bafea80d6d3e056d1c3f656d Mon Sep 17 00:00:00 2001 From: Mark Charlebois Date: Mon, 17 Mar 2014 13:18:26 +1030 Subject: module: LLVMLinux: Remove unused function warning from __param_check macro This code makes a compile time type check that is optimized away. Clang complains that it generates an unused function: linux/kernel/panic.c:471:1: warning: unused function '__check_panic' [-Wunused-function] core_param(panic, panic_timeout, int, 0644); ^ linux/moduleparam.h:283:2: note: expanded from macro 'core_param' param_check_##type(name, &(var)); \ ^ :87:1: note: expanded from here param_check_int ^ linux/moduleparam.h:369:34: note: expanded from macro 'param_check_int' #define param_check_int(name, p) __param_check(name, p, int) ^ linux/moduleparam.h:349:22: note: expanded from macro '__param_check' static inline type *__check_##name(void) { return(p); } ^ :88:1: note: expanded from here __check_panic GCC won't complain for a static inline function but would if it was just a static function. Adding the unused attribute to the function declaration removes the warning. Per request from Rusty Russell it is marked as __always_unused as the code is meant to be optimized away. This code works for both GCC and clang. Signed-off-by: Mark Charlebois Signed-off-by: Behan Webster Signed-off-by: Rusty Russell --- include/linux/moduleparam.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/moduleparam.h') diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h index c3eb102a9cc8..175f6995d1af 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 type __always_unused *__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); -- cgit v1.2.3