diff --git a/drivers/char/mbcs.c b/drivers/char/mbcs.c
index 3daf5e0a27e14078e98c2e071dc650e15f6717e4..7ee5d9444926f2d11b5b0e5d2393a184aeaa6b3b 100644
--- a/drivers/char/mbcs.c
+++ b/drivers/char/mbcs.c
@@ -39,14 +39,14 @@
 #else
 #define DBG(fmt...)
 #endif
-int mbcs_major;
+static int mbcs_major;
 
-LIST_HEAD(soft_list);
+static LIST_HEAD(soft_list);
 
 /*
  * file operations
  */
-const struct file_operations mbcs_ops = {
+static const struct file_operations mbcs_ops = {
 	.open = mbcs_open,
 	.llseek = mbcs_sram_llseek,
 	.read = mbcs_sram_read,
@@ -377,7 +377,7 @@ do_mbcs_sram_dmaread(struct mbcs_soft *soft, uint64_t hostAddr,
 	return rv;
 }
 
-int mbcs_open(struct inode *ip, struct file *fp)
+static int mbcs_open(struct inode *ip, struct file *fp)
 {
 	struct mbcs_soft *soft;
 	int minor;
@@ -394,7 +394,7 @@ int mbcs_open(struct inode *ip, struct file *fp)
 	return -ENODEV;
 }
 
-ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t * off)
+static ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t * off)
 {
 	struct cx_dev *cx_dev = fp->private_data;
 	struct mbcs_soft *soft = cx_dev->soft;
@@ -418,7 +418,7 @@ ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t *
 	return rv;
 }
 
-ssize_t
+static ssize_t
 mbcs_sram_write(struct file * fp, const char __user *buf, size_t len, loff_t * off)
 {
 	struct cx_dev *cx_dev = fp->private_data;
@@ -443,7 +443,7 @@ mbcs_sram_write(struct file * fp, const char __user *buf, size_t len, loff_t * o
 	return rv;
 }
 
-loff_t mbcs_sram_llseek(struct file * filp, loff_t off, int whence)
+static loff_t mbcs_sram_llseek(struct file * filp, loff_t off, int whence)
 {
 	loff_t newpos;
 
@@ -491,7 +491,7 @@ static void mbcs_gscr_pioaddr_set(struct mbcs_soft *soft)
 	soft->gscr_addr = mbcs_pioaddr(soft, MBCS_GSCR_START);
 }
 
-int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma)
+static int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma)
 {
 	struct cx_dev *cx_dev = fp->private_data;
 	struct mbcs_soft *soft = cx_dev->soft;
@@ -793,7 +793,7 @@ static int mbcs_remove(struct cx_dev *dev)
 	return 0;
 }
 
-const struct cx_device_id __devinitdata mbcs_id_table[] = {
+static const struct cx_device_id __devinitdata mbcs_id_table[] = {
 	{
 	 .part_num = MBCS_PART_NUM,
 	 .mfg_num = MBCS_MFG_NUM,
@@ -807,7 +807,7 @@ const struct cx_device_id __devinitdata mbcs_id_table[] = {
 
 MODULE_DEVICE_TABLE(cx, mbcs_id_table);
 
-struct cx_drv mbcs_driver = {
+static struct cx_drv mbcs_driver = {
 	.name = DEVICE_NAME,
 	.id_table = mbcs_id_table,
 	.probe = mbcs_probe,
diff --git a/drivers/char/mbcs.h b/drivers/char/mbcs.h
index e7fd47e43257396bd899fab5d1748045ef1590cc..c9905a3c3353a06b94b18a48d8b29ca8a281e136 100644
--- a/drivers/char/mbcs.h
+++ b/drivers/char/mbcs.h
@@ -542,12 +542,12 @@ struct mbcs_soft {
 	struct semaphore algolock;
 };
 
-extern int mbcs_open(struct inode *ip, struct file *fp);
-extern ssize_t mbcs_sram_read(struct file *fp, char __user *buf, size_t len,
+static int mbcs_open(struct inode *ip, struct file *fp);
+static ssize_t mbcs_sram_read(struct file *fp, char __user *buf, size_t len,
 			      loff_t * off);
-extern ssize_t mbcs_sram_write(struct file *fp, const char __user *buf, size_t len,
+static ssize_t mbcs_sram_write(struct file *fp, const char __user *buf, size_t len,
 			       loff_t * off);
-extern loff_t mbcs_sram_llseek(struct file *filp, loff_t off, int whence);
-extern int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma);
+static loff_t mbcs_sram_llseek(struct file *filp, loff_t off, int whence);
+static int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma);
 
 #endif				// __MBCS_H__