Question

我没有获得此代码的输出。我的Makefile需要做些什么改变？代码：

#define MODULE 
#define LINUX
#define __KERNEL__

#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/init.h>``
MODULE_LISENCE("GPL");
MODULE_AUTHOR("Peter Jay Salzman");


static u8 (mybyte='A');
static int (myint='i');

MODULE_PARM(mybyte, "b");
MODULE_PARM(myint, "i");

MODULE_PARM_DESC(mybyte, "this cannot do anything\n");

static int  __init hello5_init(void)

{
    printk("my byte %i\n",mybyte);
printk("my integer %i \n",myint);
 }
static void __exit hello5_exit()
{
printk("bye world\n");
}
module_init(hell05_init);
module_exit(helo5_exit);

生成文件： obj-m + = hello5.o

all:
        make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

exit:
        make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

.PHONY: all, exit

错误：

 /home/kumarmagi/Desktop/amit/hello5/hello5.c:23:24: error: ‘mybyte’ undeclared     (first       use in this function)
    /home/kumarmagi/Desktop/amit/hello5/hello5.c:23:24: note: each undeclared identifier is reported only once for each function it appears in
    /home/kumarmagi/Desktop/amit/hello5/hello5.c:24:28: error: ‘myint’ undeclared (first use in this function)
    /home/kumarmagi/Desktop/amit/hello5/hello5.c:25:1: warning: no return statement in function returning non-void [-Wreturn-type]

Answer 1

尝试改变：

MODULE_PARM(mybyte, "b");
MODULE_PARM(myint, "i");
static int (myint='i');
static u8 (mybyte='A');

为：

module_param(mybyte, short, 0660);
module_param(myint, int, 0660);
static short mybyte='A';
static int myint='i';

内核编程 - Makefile错误

1 个答案: