Hi Rocky, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ef2e9a563b0cd7965e2a1263125dcbb1c86aa6cc commit: e5d6468fe9d8dced9af0c548a359a7dbeb31c931 Bluetooth: hci_qca: Add support for Qualcomm Bluetooth SoC QCA6390 date: 5 months ago config: x86_64-randconfig-r026-20200912 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 45d0343900d3005d1d00cbb1a87c419c085dec71) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout e5d6468fe9d8dced9af0c548a359a7dbeb31c931 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static const struct qca_vreg_data qca_soc_data_wcn3990 = { ^ static const struct qca_vreg_data qca_soc_data_wcn3991 = { ^ static const struct qca_vreg_data qca_soc_data_wcn3998 = { ^ 3 warnings generated. # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout e5d6468fe9d8dced9af0c548a359a7dbeb31c931 vim +/qca_soc_data_wcn3990 +1692 drivers/bluetooth/hci_qca.c 0ff252c1976da5d Ben Young Tae Kim 2015-08-10 1691 523760b7ff88712 Harish Bandi 2019-04-26 @1692 static const struct qca_vreg_data qca_soc_data_wcn3990 = { fa9ad876b8e0ebd Balakrishna Godavarthi 2018-08-03 1693 .soc_type = QCA_WCN3990, fa9ad876b8e0ebd Balakrishna Godavarthi 2018-08-03 1694 .vregs = (struct qca_vreg []) { f2edd66e515b994 Bjorn Andersson 2019-10-17 1695 { "vddio", 15000 }, f2edd66e515b994 Bjorn Andersson 2019-10-17 1696 { "vddxo", 80000 }, f2edd66e515b994 Bjorn Andersson 2019-10-17 1697 { "vddrf", 300000 }, f2edd66e515b994 Bjorn Andersson 2019-10-17 1698 { "vddch0", 450000 }, fa9ad876b8e0ebd Balakrishna Godavarthi 2018-08-03 1699 }, fa9ad876b8e0ebd Balakrishna Godavarthi 2018-08-03 1700 .num_vregs = 4, fa9ad876b8e0ebd Balakrishna Godavarthi 2018-08-03 1701 }; fa9ad876b8e0ebd Balakrishna Godavarthi 2018-08-03 1702 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 @1703 static const struct qca_vreg_data qca_soc_data_wcn3991 = { 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1704 .soc_type = QCA_WCN3991, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1705 .vregs = (struct qca_vreg []) { 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1706 { "vddio", 15000 }, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1707 { "vddxo", 80000 }, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1708 { "vddrf", 300000 }, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1709 { "vddch0", 450000 }, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1710 }, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1711 .num_vregs = 4, 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1712 }; 7d250a062f75e6e Balakrishna Godavarthi 2019-11-06 1713 523760b7ff88712 Harish Bandi 2019-04-26 @1714 static const struct qca_vreg_data qca_soc_data_wcn3998 = { 523760b7ff88712 Harish Bandi 2019-04-26 1715 .soc_type = QCA_WCN3998, 523760b7ff88712 Harish Bandi 2019-04-26 1716 .vregs = (struct qca_vreg []) { f2edd66e515b994 Bjorn Andersson 2019-10-17 1717 { "vddio", 10000 }, f2edd66e515b994 Bjorn Andersson 2019-10-17 1718 { "vddxo", 80000 }, f2edd66e515b994 Bjorn Andersson 2019-10-17 1719 { "vddrf", 300000 }, f2edd66e515b994 Bjorn Andersson 2019-10-17 1720 { "vddch0", 450000 }, 523760b7ff88712 Harish Bandi 2019-04-26 1721 }, 523760b7ff88712 Harish Bandi 2019-04-26 1722 .num_vregs = 4, 523760b7ff88712 Harish Bandi 2019-04-26 1723 }; 523760b7ff88712 Harish Bandi 2019-04-26 1724 :::::: The code at line 1692 was first introduced by commit :::::: 523760b7ff8871281aaedc44c305926469ab47f8 Bluetooth: hci_qca: Added support for WCN3998 :::::: TO: Harish Bandi <c-hbandi(a)codeaurora.org&gt; :::::: CC: Marcel Holtmann <marcel(a)holtmann.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org