Hi Rudi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bb7c241fae6228e89c0286ffd6f249b3b0dea225]

url:    https://github.com/intel-lab-lkp/linux/commits/Rudi-Heitbaum/dt-bindings-net-realtek-bluetooth-Add-RTL8822BS/20230514-155000
base:   bb7c241fae6228e89c0286ffd6f249b3b0dea225
patch link:    https://lore.kernel.org/r/20230514074731.70614-3-rudi%40heitbaum.com
patch subject: [PATCH 2/3] Bluetooth: btrtl: Add support for RTL8822BS UART
config: arm-randconfig-r004-20230514
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b0fb98227c90adf2536c9ad644a74d5e92961111)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/2f68c37a4fd8f66ba45a8ff74d845954644401e0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Rudi-Heitbaum/dt-bindings-net-realtek-bluetooth-Add-RTL8822BS/20230514-155000
        git checkout 2f68c37a4fd8f66ba45a8ff74d845954644401e0
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/bluetooth/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot [off-list ref]
| Link: https://lore.kernel.org/oe-kbuild-all/202305141652.RsLrMY8N-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

quoted

drivers/bluetooth/btrtl.c:1195:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]

           default:
           ^
   drivers/bluetooth/btrtl.c:1195:2: note: insert '__attribute__((fallthrough));' to silence this warning
           default:
           ^
           __attribute__((fallthrough)); 
   drivers/bluetooth/btrtl.c:1195:2: note: insert 'break;' to avoid fall-through
           default:
           ^
           break; 
   1 warning generated.


vim +1195 drivers/bluetooth/btrtl.c

26503ad25de8c7c Martin Blumenstingl    2018-08-02  1164  
3011faa29bc6f45 Archie Pusaka          2021-05-27  1165  void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
26503ad25de8c7c Martin Blumenstingl    2018-08-02  1166  {
65251e2e0ad379d Alex Lu                2019-08-30  1167  	/* Enable controller to do both LE scan and BR/EDR inquiry
65251e2e0ad379d Alex Lu                2019-08-30  1168  	 * simultaneously.
65251e2e0ad379d Alex Lu                2019-08-30  1169  	 */
65251e2e0ad379d Alex Lu                2019-08-30  1170  	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
65251e2e0ad379d Alex Lu                2019-08-30  1171  
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1172  	/* Enable central-peripheral role (able to create new connections with
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1173  	 * an existing connection in slave role).
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1174  	 */
9ab9235fe5cf7f8 Max Chou               2021-01-27  1175  	/* Enable WBS supported for the specific Realtek devices. */
9ab9235fe5cf7f8 Max Chou               2021-01-27  1176  	switch (btrtl_dev->project_id) {
9ab9235fe5cf7f8 Max Chou               2021-01-27  1177  	case CHIP_ID_8822C:
9ab9235fe5cf7f8 Max Chou               2021-01-27  1178  	case CHIP_ID_8852A:
18e8055c88142d8 Max Chou               2022-03-14  1179  	case CHIP_ID_8852B:
8b1d66b50437b65 Max Chou               2022-04-11  1180  	case CHIP_ID_8852C:
7948fe1c92d9231 Max Chou               2023-04-18  1181  	case CHIP_ID_8851B:
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1182  		set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
9ab9235fe5cf7f8 Max Chou               2021-01-27  1183  		set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
a479e71322ced3e Hilda Wu               2022-10-05  1184  
a479e71322ced3e Hilda Wu               2022-10-05  1185  		/* RTL8852C needs to transmit mSBC data continuously without
a479e71322ced3e Hilda Wu               2022-10-05  1186  		 * the zero length of USB packets for the ALT 6 supported chips
a479e71322ced3e Hilda Wu               2022-10-05  1187  		 */
a479e71322ced3e Hilda Wu               2022-10-05  1188  		if (btrtl_dev->project_id == CHIP_ID_8852C)
a479e71322ced3e Hilda Wu               2022-10-05  1189  			btrealtek_set_flag(hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP);
a479e71322ced3e Hilda Wu               2022-10-05  1190  
099c6d31764b97d Joseph Hwang           2021-09-26  1191  		hci_set_aosp_capable(hdev);
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1192  		break;
2f68c37a4fd8f66 Rudi Heitbaum          2023-05-14  1193  	case CHIP_ID_8822B:
2f68c37a4fd8f66 Rudi Heitbaum          2023-05-14  1194  		set_bit(HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2, &hdev->quirks);
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22 @1195  	default:
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1196  		rtl_dev_dbg(hdev, "Central-peripheral role not enabled.");
9ab9235fe5cf7f8 Max Chou               2021-01-27  1197  		rtl_dev_dbg(hdev, "WBS supported not enabled.");
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1198  		break;
05672a2c14a4ea2 Abhishek Pandit-Subedi 2020-12-22  1199  	}
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1200  
253cf30e8d3d001 Max Chou               2023-03-21  1201  	if (!btrtl_dev->ic_info)
253cf30e8d3d001 Max Chou               2023-03-21  1202  		return;
253cf30e8d3d001 Max Chou               2023-03-21  1203  
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1204  	switch (btrtl_dev->ic_info->lmp_subver) {
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1205  	case RTL_ROM_LMP_8703B:
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1206  		/* 8723CS reports two pages for local ext features,
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1207  		 * but it doesn't support any features from page 2 -
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1208  		 * it either responds with garbage or with error status
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1209  		 */
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1210  		set_bit(HCI_QUIRK_BROKEN_LOCAL_EXT_FEATURES_PAGE_2,
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1211  			&hdev->quirks);
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1212  		break;
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1213  	default:
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1214  		break;
c0123cb6c4c7fc2 Vasily Khoruzhick      2023-03-07  1215  	}
3011faa29bc6f45 Archie Pusaka          2021-05-27  1216  }
3011faa29bc6f45 Archie Pusaka          2021-05-27  1217  EXPORT_SYMBOL_GPL(btrtl_set_quirks);
3011faa29bc6f45 Archie Pusaka          2021-05-27  1218  

-- 
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https://github.com/intel/lkp-tests