Hi Yan-Hsuan,

[auto build test ERROR on wireless-drivers-next/master]
[also build test ERROR on v4.11-rc4 next-20170331]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Larry-Finger/rtlwifi-btcoex-Improve-Bluetooth-coexistence/20170402-183253
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next.git master
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

Note: the linux-review/Larry-Finger/rtlwifi-btcoex-Improve-Bluetooth-coexistence/20170402-183253 HEAD 053f68d46680b7af274834966e1a0bde82fd12e4 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   drivers/net/wireless//realtek/rtlwifi/btcoexist/halbtc8723b1ant.c: In function 'halbtc8723b1ant_run_coexist_mechanism':
>> drivers/net/wireless//realtek/rtlwifi/btcoexist/halbtc8723b1ant.c:1667:4: error: 'wifi_rssi_state' undeclared (first use in this function)
       wifi_rssi_state =
       ^~~~~~~~~~~~~~~
   drivers/net/wireless//realtek/rtlwifi/btcoexist/halbtc8723b1ant.c:1667:4: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/net/wireless//realtek/rtlwifi/btcoexist/halbtc8723b1ant.c:1668:5: error: implicit declaration of function 'halbtc8723b1ant_wifi_rssi_state' [-Werror=implicit-function-declaration]
        halbtc8723b1ant_wifi_rssi_state(btcoexist,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   At top level:
   drivers/net/wireless//realtek/rtlwifi/btcoexist/halbtc8723b1ant.c:1032:13: warning: 'btc8723b1ant_tdma_dur_adj_for_acl' defined but not used [-Wunused-function]
    static void btc8723b1ant_tdma_dur_adj_for_acl(struct btc_coexist *btcoexist,
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/wifi_rssi_state +1667 drivers/net/wireless//realtek/rtlwifi/btcoexist/halbtc8723b1ant.c

f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1661  	}
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1662  
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1663  	if (!bt_link_info->sco_exist && !bt_link_info->hid_exist) {
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1664  		halbtc8723b1ant_limited_tx(btcoexist, NORMAL_EXEC, 0, 0, 0, 0);
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1665  	} else {
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1666  		if (wifi_connected) {
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04 @1667  			wifi_rssi_state =
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04 @1668  				halbtc8723b1ant_wifi_rssi_state(btcoexist,
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1669  								1, 2, 30, 0);
f5b58690 drivers/net/wireless/rtlwifi/btcoexist/halbtc8723b1ant.c         Larry Finger 2014-09-04  1670  			halbtc8723b1ant_limited_tx(btcoexist,
b686784d drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b1ant.c Larry Finger 2017-02-11  1671  						   NORMAL_EXEC, 1, 1, 1, 1);

:::::: The code at line 1667 was first introduced by commit
:::::: f5b5869095819970333dc9de54eed5c552407d35 rtlwifi: btcoexist: Modify driver to support BT coexistence in rtl8723be

:::::: TO: Larry Finger <Larry.Finger@lwfinger.net>
:::::: CC: John W. Linville <linville@tuxdriver.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation