diff --git a/README.md b/README.md
index f31f8b3..d0cb63d 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ For compiling type
 `make`  
 in source dir  
 
+* NOTE: For some ARM 64-bit system, add argument `ARCH=arm64` if the above command doesn't work
+
 For install the driver use  
 `sudo insmod mt7612u.ko`  
 
diff --git a/chips/mt76x2.c b/chips/mt76x2.c
index c8f3ef8..2fb26d4 100644
--- a/chips/mt76x2.c
+++ b/chips/mt76x2.c
@@ -1624,6 +1624,7 @@ int mt76x2_get_rx_high_gain(RTMP_ADAPTER *ad)
 		else
 			cap->rf1_5g_grp5_rx_high_gain = -((value & RF1_5G_GRP5_RX_HIGH_GAIN_MASK) >> 12);
 	}
+	return 0;
 }
 
 static int mt76x2_get_tx_pwr_info(RTMP_ADAPTER *ad)
@@ -2330,6 +2331,8 @@ static int mt76x2_get_tx_pwr_info(RTMP_ADAPTER *ad)
 	/* check PA type combination */
 	RT28xx_EEPROM_READ16(ad, EEPROM_NIC1_OFFSET, value);
 	cap->PAType= GET_PA_TYPE(value);
+
+	return 0;
 }
 
 static u8 mt76x2_txpwr_chlist[] = {
@@ -2415,6 +2418,7 @@ static INT rf_tr_agc_config(RTMP_ADAPTER *pAd, INT rf_bw)
 	signed char rx_agc_fc_offset[3] = {2,2,2}; /* array idx 0: 20M, 1:40M, 2:80m */
 	UINT8 tx_agc_fc_offset[3] = {0,0,0}; /* array idx 0: 20M, 1:40M, 2:80m */
 	CHAR rf32_val, rf31_val, rf_diff;
+	return 0;
 }
 
 void mt76x2_get_tx_pwr_per_rate(RTMP_ADAPTER *ad)
diff --git a/common/rt_channel.c b/common/rt_channel.c
index 6bc1a7b..a411d04 100644
--- a/common/rt_channel.c
+++ b/common/rt_channel.c
@@ -2052,6 +2052,7 @@ INT get_vht_neighbor_index(IN UCHAR channel)
 		|| (channel == 144) || (channel == 161)) {
 		return -3;
 	}
+	return 0;
 }
 
 BOOLEAN AC_ChannelGroupCheck(
diff --git a/include/os/rt_linux.h b/include/os/rt_linux.h
index 58ca183..c27756b 100644
--- a/include/os/rt_linux.h
+++ b/include/os/rt_linux.h
@@ -537,8 +537,11 @@ typedef struct tasklet_struct  *POS_NET_TASK_STRUCT;
 typedef struct timer_list	OS_NDIS_MINIPORT_TIMER;
 typedef struct timer_list	OS_TIMER;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+typedef void (*TIMER_FUNCTION)(struct timer_list*);
+#else
 typedef void (*TIMER_FUNCTION)(unsigned long);
-
+#endif
 
 #define OS_WAIT(_time) \
 {	\
diff --git a/os/linux/rt_linux.c b/os/linux/rt_linux.c
index 9692027..3b0d269 100644
--- a/os/linux/rt_linux.c
+++ b/os/linux/rt_linux.c
@@ -150,9 +150,13 @@ static inline VOID __RTMP_OS_Init_Timer(
 	IN PVOID data)
 {
 	if (!timer_pending(pTimer)) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)		
+		timer_setup(pTimer, function, data);
+#else
 		init_timer(pTimer);
 		pTimer->data = (unsigned long)data;
 		pTimer->function = function;
+#endif
 	}
 }
 
diff --git a/os/linux/sta_ioctl.c b/os/linux/sta_ioctl.c
index 3bf05a8..4b03272 100644
--- a/os/linux/sta_ioctl.c
+++ b/os/linux/sta_ioctl.c
@@ -2510,7 +2510,11 @@ INT rt28xx_sta_ioctl(struct net_device *net_dev, struct ifreq *rq, INT cmd)
 		case SIOCGIWPRIV:
 			if (wrqin->u.data.pointer)
 			{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+				if ( access_ok(wrqin->u.data.pointer, sizeof(privtab)) != TRUE)
+#else
 				if ( access_ok(VERIFY_WRITE, wrqin->u.data.pointer, sizeof(privtab)) != TRUE)
+#endif
 					break;
 				if ((sizeof(privtab) / sizeof(privtab[0])) <= wrq->u.data.length)
 				{
@@ -2523,7 +2527,11 @@ INT rt28xx_sta_ioctl(struct net_device *net_dev, struct ifreq *rq, INT cmd)
 			}
 			break;
 		case RTPRIV_IOCTL_SET:
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+			if(access_ok(wrqin->u.data.pointer, wrqin->u.data.length) != TRUE)
+#else
 			if(access_ok(VERIFY_READ, wrqin->u.data.pointer, wrqin->u.data.length) != TRUE)
+#endif
 					break;
 			return rt_ioctl_setparam(net_dev, NULL, NULL, wrqin->u.data.pointer);
 			break;