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insmod時出現(xiàn)：globalmem :unknown symbol malloc_sizes
insmod:can't insert 'globalmem.ko' :unknown symbol in module or invalid parameter,到底應(yīng)該如何解決呢？在此謝謝了。
我的內(nèi)核版本是2.6.31.
查看內(nèi)核源碼知道m(xù)m中的slab.c中有malloc_sizes的定義及導(dǎo)出符號。
我的源文件如下：
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cdev.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/slab.h>
#define GLOBALMEM_SIZE 4096 /*全局內(nèi)存大小：4KB*/
#define MEM_CLEAR 0x1 /*清零全局內(nèi)存*/
#define GLOBALMEM_MAJOR 0 /*預(yù)設(shè)的globalmem的主設(shè)備號*/
static globalmem_major = GLOBALMEM_MAJOR;
/*globalmem設(shè)備結(jié)構(gòu)體*/
struct globalmem_dev
{
struct cdev cdev; /*cdev結(jié)構(gòu)體*/
unsigned char mem[GLOBALMEM_SIZE]; /*全局內(nèi)存*/
};
struct globalmem_dev *globalmem_devp; /*設(shè)備結(jié)構(gòu)體指針*/
/*文件打開函數(shù)*/
int globalmem_open(struct inode *inode, struct file *filp)
{
/*將設(shè)備結(jié)構(gòu)體指針賦值給文件私有數(shù)據(jù)指針*/
filp->private_data = globalmem_devp;
return 0;
}
/*文件釋放函數(shù)*/
int globalmem_release(struct inode *inode, struct file *filp)
{
return 0;
}
/*ioctl設(shè)備控制函數(shù)*/
static int globalmem_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct globalmem_dev *dev = filp->private_data; /*獲得設(shè)備結(jié)構(gòu)體指針*/
switch(cmd)
{
case MEM_CLEAR:
memset(dev->mem, 0, GLOBALMEM_SIZE);
printk(KERN_INFO "globalmem is set to zero\n");
break;
default:
return -EINVAL;
}
return 0;
}
/*讀函數(shù)*/
static ssize_t globalmem_read(struct file *filp, char __user *buf,
size_t size, loff_t *ppos)
{
unsigned long p = *ppos;
unsigned int count =size;
int ret = 0;
struct globalmem_dev *dev = filp->private_data; /*獲得設(shè)備結(jié)構(gòu)體指針*/
/*分析和獲取有效的寫長度*/
if(p >= GLOBALMEM_SIZE)
return 0;
if(count > GLOBALMEM_SIZE - p)
count = GLOBALMEM_SIZE -p;
/*讀數(shù)據(jù)到用戶空閑*/
if(copy_to_user(buf, (void *)(dev->mem + p), count))
{
ret = -EFAULT;
}
else
{
*ppos += count;
ret = count;
printk(KERN_INFO "read %d bytes(s) from %d\n",count, p);
}
return ret;
}
/*寫函數(shù)*/
static ssize_t globalmem_write(struct file *filp, const char __user *buf,
size_t size, loff_t *ppos)
{
unsigned long p = *ppos;
unsigned int count =size;
int ret = 0;
struct globalmem_dev *dev = filp->private_data; /*獲得設(shè)備結(jié)構(gòu)體指針*/
/*分析和獲取有效的寫長度*/
if(p > GLOBALMEM_SIZE)
return 0;
if(count > GLOBALMEM_SIZE - p)
count = GLOBALMEM_SIZE - p;
/*從用戶空間寫入數(shù)據(jù)*/
if(copy_from_user(dev->mem + p, buf, count))
ret = -EFAULT;
else
{
*ppos += count;
ret = count;
printk(KERN_INFO "written %d bytes(s) from %d\n",count, p);
}
return ret;
}
/**/
static loff_t globalmem_llseek(struct file *filp, loff_t offset, int whence)
{
loff_t newpos = 0;
switch(whence)
{
case 0: /* SEEK_SET */
newpos = offset;
break;
case 1: /* SEEK_CUR */
newpos = filp->f_pos + offset;
break;
case 2: /* SEEK_END */
newpos = filp->f_pos -1 + offset;
break;
default: /* can't happen */
return -EINVAL;
}
if((newpos < 0)||(newpos > GLOBALMEM_SIZE))
return -EINVAL;
filp->f_pos = newpos;
return newpos;
}
static const struct file_operations globalmem_fops =
{
.owner = THIS_MODULE,
.llseek = globalmem_llseek,
.open = globalmem_open,
.release = globalmem_release,
.read = globalmem_read,
.write = globalmem_write,
.ioctl = globalmem_ioctl,
};
static int globalmem_init(void)
{
int result;
int err;
dev_t devno = MKDEV(globalmem_major,0); /*得到設(shè)備編號*/
/*申請設(shè)備號*/
if(globalmem_major)
result = register_chrdev_region(devno, 1, "globalmem");
else
{
result = alloc_chrdev_region(&devno, 0, 1, "globalmem");
globalmem_major = MAJOR(devno);
}
if(result < 0)
return result;
/*初始化cdev結(jié)構(gòu)*/
cdev_init(&globalmem_devp->cdev, &globalmem_fops);
globalmem_devp->cdev.owner = THIS_MODULE;
globalmem_devp->cdev.ops = &globalmem_fops;
/*注冊字符設(shè)備*/
err = cdev_add(&globalmem_devp->cdev, devno, 1);
if(err)
printk(KERN_NOTICE "Error %d adding globalmem",err);
/* 為設(shè)備描述結(jié)構(gòu)分配內(nèi)存*/
globalmem_devp = kmalloc(sizeof(struct globalmem_dev), GFP_KERNEL);
if(!globalmem_devp) /*申請失敗*/
{
result = -ENOMEM;
goto fail_malloc;
}
memset(globalmem_devp, 0, sizeof(struct globalmem_dev));
return 0;
fail_malloc:unregister_chrdev_region(devno, 1);
return result;
}
void globalmem_exit(void)
{
cdev_del(&globalmem_devp->cdev); /*注銷cdev*/
kfree(globalmem_devp); /*釋放設(shè)備結(jié)構(gòu)體內(nèi)存*/
unregister_chrdev_region(MKDEV(globalmem_major, 0), 1); /*釋放設(shè)備號*/
}
MODULE_AUTHOR("Jin huatian");
MODULE_LICENSE("GPL");
module_init(globalmem_init);
module_exit(globalmem_exit); |
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