diff --git a/os_dep/osdep_service.c b/os_dep/osdep_service.c
index 78abcfb..2156243 100644
--- a/os_dep/osdep_service.c
+++ b/os_dep/osdep_service.c
@@ -1944,7 +1944,9 @@ static int isFileReadable(char *path)
 { 
 	struct file *fp;
 	int ret = 0;
+#ifdef get_fs
 	mm_segment_t oldfs;
+#endif
 	char buf;
  
 	fp=filp_open(path, O_RDONLY, 0); 
@@ -1952,12 +1954,15 @@ static int isFileReadable(char *path)
 		ret = PTR_ERR(fp);
 	}
 	else {
-		oldfs = get_fs(); set_fs(KERNEL_DS);
-		
+#ifdef get_fs
+		oldfs = get_fs();
+		set_fs(KERNEL_DS);
+#endif
 		if(1!=readFile(fp, &buf, 1))
 			ret = PTR_ERR(fp);
-		
+#ifdef get_fs	
 		set_fs(oldfs);
+#endif
 		filp_close(fp,NULL);
 	}	
 	return ret;
@@ -1973,16 +1978,23 @@ static int isFileReadable(char *path)
 static int retriveFromFile(char *path, u8* buf, u32 sz)
 {
 	int ret =-1;
+#ifdef get_fs 
 	mm_segment_t oldfs;
+#endif
 	struct file *fp;
 
 	if(path && buf) {
 		if( 0 == (ret=openFile(&fp,path, O_RDONLY, 0)) ){
 			DBG_871X("%s openFile path:%s fp=%p\n",__FUNCTION__, path ,fp);
 
-			oldfs = get_fs(); set_fs(KERNEL_DS);
+#ifdef get_fs
+			oldfs = get_fs();
+			set_fs(KERNEL_DS);
+#endif
 			ret=readFile(fp, buf, sz);
+#ifdef get_fs
 			set_fs(oldfs);
+#endif
 			closeFile(fp);
 			
 			DBG_871X("%s readFile, ret:%d\n",__FUNCTION__, ret);
@@ -2007,16 +2019,23 @@ static int retriveFromFile(char *path, u8* buf, u32 sz)
 static int storeToFile(char *path, u8* buf, u32 sz)
 {
 	int ret =0;
+#ifdef get_fs
 	mm_segment_t oldfs;
+#endif
 	struct file *fp;
 	
 	if(path && buf) {
 		if( 0 == (ret=openFile(&fp, path, O_CREAT|O_WRONLY, 0666)) ) {
 			DBG_871X("%s openFile path:%s fp=%p\n",__FUNCTION__, path ,fp);
 
-			oldfs = get_fs(); set_fs(KERNEL_DS);
+#ifdef get_fs
+			oldfs = get_fs();
+			set_fs(KERNEL_DS);
+#endif
 			ret=writeFile(fp, buf, sz);
+#ifdef get_fs
 			set_fs(oldfs);
+#endif
 			closeFile(fp);
 
 			DBG_871X("%s writeFile, ret:%d\n",__FUNCTION__, ret);