c编程(linux)

1. function declaration isn't a prototype

error: static void print_dcache_info(); 

normal:static void print_dcache_info(void); 

In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing. I suggest that you use void consistently when you mean no arguments.

来源： <http://stackoverflow.com/questions/42125/function-declaration-isnt-a-prototype>

2.解决undefined reference to `__aeabi_uidivmod'

编译 linux driver出现这个问题，后来反复实验发现，与64位除法有关；

嵌入式内核只支持32运算，对于64位运算除法要用divu64

#include <linux/math64.h>