diff --git a/os_dep/os_intfs.c b/os_dep/os_intfs.c
index e9ed317..12bfb41 100644
--- a/os_dep/os_intfs.c
+++ b/os_dep/os_intfs.c
@@ -416,7 +416,7 @@ static unsigned int rtw_classify8021d(struct sk_buff *skb)
 static u16 rtw_select_queue(struct net_device *dev, struct sk_buff *skb,
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0))
 			    struct net_device *sb_dev
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0))
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0))
 			    struct net_device *sb_dev,
 			    select_queue_fallback_t fallback
 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0))
diff --git a/os_dep/osdep_service.c b/os_dep/osdep_service.c
index ad7a7f3..a169ffc 100644
--- a/os_dep/osdep_service.c
+++ b/os_dep/osdep_service.c
@@ -905,7 +905,9 @@ static int isFileReadable(char *path)
 {
 	struct file *fp;
 	int ret = 0;
+#ifdef set_fs
 	mm_segment_t oldfs;
+#endif
 	char buf;
 
 	fp=filp_open(path, O_RDONLY, 0);
@@ -913,12 +915,16 @@ static int isFileReadable(char *path)
 		ret = PTR_ERR(fp);
 	}
 	else {
+#ifdef set_fs
 		oldfs = get_fs(); set_fs(KERNEL_DS);
+#endif
 
 		if (1!=readFile(fp, &buf, 1))
 			ret = PTR_ERR(fp);
 
+#ifdef set_fs
 		set_fs(oldfs);
+#endif
 		filp_close(fp,NULL);
 	}
 	return ret;
@@ -940,7 +946,9 @@ static int retriveFromFile(char *path, u8* buf, u32 sz)
 		if ( 0 == (ret=openFile(&fp,path, O_RDONLY, 0)) ) {
 			DBG_88E("%s openFile path:%s fp=%p\n",__FUNCTION__, path ,fp);
 
+#ifdef set_fs
 			set_fs(KERNEL_DS);
+#endif
 			ret=readFile(fp, buf, sz);
 			closeFile(fp);
 
@@ -972,7 +980,9 @@ static int storeToFile(char *path, u8* buf, u32 sz)
 		if ( 0 == (ret=openFile(&fp, path, O_CREAT|O_WRONLY, 0666)) ) {
 			DBG_88E("%s openFile path:%s fp=%p\n",__FUNCTION__, path ,fp);
 
+#ifdef set_fs
 			set_fs(KERNEL_DS);
+#endif
 			ret=writeFile(fp, buf, sz);
 			closeFile(fp);
 
diff --git a/os_dep/rtw_android.c b/os_dep/rtw_android.c
index ec62ddf..7c6bc9c 100644
--- a/os_dep/rtw_android.c
+++ b/os_dep/rtw_android.c
@@ -356,7 +356,7 @@ int rtw_android_priv_cmd(struct net_device *net, struct ifreq *ifr, int cmd)
 		goto exit;
 	}
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0))
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0))
 	if (!access_ok(priv_cmd.buf, priv_cmd.total_len)) {
 #else
 	if (!access_ok(VERIFY_READ, (const void __user *)priv_cmd.buf,