Linux模块调用模块

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被调用模块add_sub.c#include <linux/init.h>#include <linux/module.h>#include "add_sub.h"long add_int(long a,long b){    return a+b;}long sub_int(long a,long b){    return a-b;}EXPORT_SYMBOL(add_int);EXPORT_SYMBOL(sub_int);MODULE_LICENSE("Dual BSD/GPL");add_sub.h#ifndef _ADD_SUB_H_#define _ADD_SUB_H_long add_int(long a,long b);    long sub_int(long a,long b);#endifMakefileobj-m := add_sub.o  KDIR :=/home/sink/work/src/linux/linux-2.6.38  all:      make -C $(KDIR) M=$(shell pwd) modules  clean:      make -C $(KDIR) M=$(shell pwd) clean  测试调用模块test.c#include <linux/init.h>#include <linux/module.h>#include "add_sub.h"static long a =1;static long b =2;static int AddOrSub = 1;#define ADD 1#define SUB 2static int test_init(void){    long result = 0;    printk(KERN_ALERT "test init\n");    if(ADD==AddOrSub)    {        result = add_int(a,b);    }    else    {            result = sub_int(a,b);    }    printk("The result = %d",result);    return 0;}static void test_exit(void){    printk("exit test!\n");}module_init(test_init);module_exit(test_exit);module_param(a,long,S_IRUGO);module_param(b,long,S_IRUGO);module_param(AddOrSub,int,S_IRUGO);MODULE_LICENSE("Dual BSD/GPL");MODULE_VERSION("V1.0");Makefileobj-m := test.o  KDIR :=/home/sink/work/src/linux/linux-2.6.38  all:      make -C $(KDIR) M=$(shell pwd) modules  clean:      make -C $(KDIR) M=$(shell pwd) clean
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