Hi Frank, It's probably a bug fix that unveils the link errors. tree: https://github.com/frank-w/BPI-R2-4.14 5.6-main head: 1944ca382365022a8bf3895ee49b47f24e810b5d commit: 32f5d961d2f60cf7ed4c9419d2a61eb2deef439a [40/41] mt76_new: replace rcu_swap_protected by rcu_replace_pointer config: parisc-allyesconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 32f5d961d2f60cf7ed4c9419d2a61eb2deef439a # save the attached .config to linux build tree GCC_VERSION=9.3.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x2/pci.o: in function `mt76pci_remove': hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x2/pci.o: in function `mt76pci_probe': hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x2/usb.o: in function `mt76x2u_probe': (.text+0x58): undefined reference to `mt76_alloc_device' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/usb.o: in function `mt76x0u_stop': hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/usb.o: in function `mt76x0u_probe': (.text+0x708): undefined reference to `mt76_alloc_device' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/pci.o: in function `mt76x0e_stop_hw': (.text+0x7c): undefined reference to `__mt76_poll' hppa-linux-ld: (.text+0xd4): undefined reference to `__mt76_poll' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/pci.o: in function `mt76x0e_probe': (.text+0x1c8): undefined reference to `mt76_alloc_device' hppa-linux-ld: (.text+0x1fc): undefined reference to `mt76_mmio_init' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/pci.o: in function `mt76x0e_remove': (.text+0x5a8): undefined reference to `mt76_unregister_device' hppa-linux-ld: (.text+0x708): undefined reference to `mt76_free_device' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/pci.o:(.rodata+0x180): undefined reference to `mt76_release_buffered_frames' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/pci.o:(.rodata+0x1d8): undefined reference to `mt76_get_txpower' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x0/pci.o:(.rodata+0x1e8): undefined reference to `mt76_wake_tx_queue' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_set_antenna': (.text+0x33c): undefined reference to `mt76_set_stream_caps' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_ampdu_action': (.text+0x47c): undefined reference to `mt76_rx_aggr_start' hppa-linux-ld: (.text+0x4a0): undefined reference to `mt76_rx_aggr_stop' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_sta_remove': (.text+0x70c): undefined reference to `mt76_sta_state' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_sta_add': (.text+0x750): undefined reference to `mt76_sta_state' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_set_key': (.text+0x8fc): undefined reference to `mt76_wcid_key_setup' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_remove_interface': (.text+0xaec): undefined reference to `mt76_txq_remove' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_tx': (.text+0xc00): undefined reference to `mt76_tx' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_config': (.text+0xd64): undefined reference to `mt76_set_channel' hppa-linux-ld: (.text+0xe7c): undefined reference to `mt76_txq_schedule_all' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_add_interface': (.text+0x1334): undefined reference to `mt76_txq_init' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `mt7615_mac_sta_add': (.text+0x15a0): undefined reference to `mt76_wcid_alloc' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt7615/main.o: in function `.L196': (.rodata+0xb8): undefined reference to `mt76_sw_scan' hppa-linux-ld: (.rodata+0xbc): undefined reference to `mt76_sw_scan_complete' hppa-linux-ld: (.rodata+0x114): undefined reference to `mt76_get_survey' hppa-linux-ld: (.rodata+0x134): undefined reference to `mt76_get_antenna' hppa-linux-ld: (.rodata+0x158): undefined reference to `mt76_release_buffered_frames' hppa-linux-ld: (.rodata+0x1b0): undefined reference to `mt76_get_txpower' hppa-linux-ld: (.rodata+0x1c0): undefined reference to `mt76_wake_tx_queue' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_util.o: in function `mt76x02_add_interface': (.text+0x800): undefined reference to `mt76_txq_init' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_util.o: in function `mt76x02_remove_interface': (.text+0x884): undefined reference to `mt76_txq_remove' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_util.o: in function `mt76x02_ampdu_action': (.text+0x968): undefined reference to `mt76_rx_aggr_start' hppa-linux-ld: (.text+0x9ac): undefined reference to `mt76_rx_aggr_stop' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_util.o: in function `mt76x02_set_key': (.text+0xbe0): undefined reference to `mt76_wcid_key_setup' hppa-linux-ld: (.text+0xc04): undefined reference to `mt76_wcid_key_setup' hppa-linux-ld: (.text+0xc1c): undefined reference to `mt76_wcid_key_setup' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_util.o: in function `mt76x02_sta_ps': (.text+0xeb0): undefined reference to `mt76_stop_tx_queues' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_util.o: in function `mt76x02_sta_add': (.text+0x110c): undefined reference to `mt76_wcid_alloc' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mac.o: in function `mt76x02_send_tx_status': (.text+0x1d60): undefined reference to `mt76_tx_status_skb_get' hppa-linux-ld: (.text+0x1e08): undefined reference to `mt76_tx_status_unlock' hppa-linux-ld: (.text+0x1e98): undefined reference to `mt76_tx_status_skb_done' hppa-linux-ld: (.text+0x1ec4): undefined reference to `mt76_tx_status_unlock' hppa-linux-ld: (.text+0x1ef0): undefined reference to `mt76_calc_tx_airtime' hppa-linux-ld: (.text+0x1f54): undefined reference to `mt76_tx_status_unlock' hppa-linux-ld: (.text+0x1f78): undefined reference to `mt76_tx_status_lock' hppa-linux-ld: (.text+0x1f94): undefined reference to `mt76_tx_status_lock' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mac.o: in function `mt76x02_tx_complete_skb': (.text+0x279c): undefined reference to `mt76_tx_complete_skb' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mac.o: in function `mt76x02_mac_work': (.text+0x2bf8): undefined reference to `mt76_update_survey' hppa-linux-ld: (.text+0x2e98): undefined reference to `mt76_tx_status_check' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mcu.o: in function `mt76x02_mcu_msg_send': (.text+0x150): undefined reference to `mt76_mcu_msg_alloc' hppa-linux-ld: (.text+0x18c): undefined reference to `mt76_mcu_get_response' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mcu.o: in function `mt76x02_mcu_calibrate': (.text+0x320): undefined reference to `__mt76_poll_msec' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_eeprom.o: in function `mt76x02_get_efuse_data': (.text+0x3cc): undefined reference to `__mt76_poll_msec' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_rx_poll_complete': (.text+0x158): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02e_beacon_enable': (.text+0x1d4): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: (.text+0x1ec): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_pre_tbtt_tasklet': (.text+0x2e0): undefined reference to `mt76_csa_check' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_tx_tasklet': (.text+0x488): undefined reference to `mt76_txq_schedule_all' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_init_tx_queue': (.text+0x55c): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_dma_cleanup': (.text+0x5c8): undefined reference to `mt76_dma_cleanup' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_mac_start': (.text+0x644): undefined reference to `__mt76_poll' hppa-linux-ld: (.text+0x6e0): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_init_rx_queue.constprop.0': (.text+0x7d0): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_poll_tx': (.text+0xa1c): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_irq_handler': (.text+0xc6c): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: (.text+0xca0): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: (.text+0xd80): undefined reference to `mt76_csa_finish' hppa-linux-ld: (.text+0xdd4): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: (.text+0xe08): undefined reference to `mt76_set_irq_mask' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_dma_init': (.text+0xf94): undefined reference to `mt76_dma_attach' hppa-linux-ld: (.text+0xfc4): undefined reference to `mt76_ac_to_hwq' hppa-linux-ld: drivers/net/wireless/mediatek/mt76_new/mt76x02_mmio.o: in function `mt76x02_watchdog_reset': (.text+0x15bc): undefined reference to `__mt76_sta_remove' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org