tree: https://github.com/frank-w/BPI-R2-4.14 5.14-rc head: 15ab19c94d88070dd93ad282b83ff856be6092fc commit: 6c7a57f4d7a96ee09d6aacbdac04d2f3b3da24f6 [6/24] mt6625l: include wifi-code config: arm-randconfig-c002-20210822 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9e9d70591e72fc6762b4b9a226b68ed1307419bf) 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/frank-w/BPI-R2-4.14/commit/6c7a57f4d7a96ee09d6aacbdac0... git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14 git fetch --no-tags frank-w-bpi-r2-4.14 5.14-rc git checkout 6c7a57f4d7a96ee09d6aacbdac04d2f3b3da24f6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): int i_ret = 0; ^ int result = 0; ^ unsigned char *p_buf = NULL; ^ 3 warnings generated. -- unsigned int flag = 0; ^ 1 warning generated. -- unsigned int flag = 0; ^ 1 warning generated. vim +/i_ret +379 drivers/misc/mediatek/btif/common/mtk_btif.c eca6cb9d1200e7 Frank Wunderlich 2021-07-12 376 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 377 static int mtk_btif_restore_noirq(struct device *dev) eca6cb9d1200e7 Frank Wunderlich 2021-07-12 378 { eca6cb9d1200e7 Frank Wunderlich 2021-07-12 @379 int i_ret = 0; eca6cb9d1200e7 Frank Wunderlich 2021-07-12 380 struct platform_device *pdev = to_platform_device(dev); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 381 p_mtk_btif p_btif = platform_get_drvdata(pdev); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 382 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 383 BTIF_INFO_FUNC("++\n"); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 384 if (_btif_state_hold(p_btif)) eca6cb9d1200e7 Frank Wunderlich 2021-07-12 385 return E_BTIF_INTR; eca6cb9d1200e7 Frank Wunderlich 2021-07-12 386 if (p_btif->enable) eca6cb9d1200e7 Frank Wunderlich 2021-07-12 387 BTIF_ERR_FUNC("!!!-----------------!BTIF is not closed before IPOH shutdown!!!---------------!\n"); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 388 WARN_ON(p_btif->enable); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 389 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 390 i_ret = _btif_restore_noirq(p_btif); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 391 BTIF_STATE_RELEASE(p_btif); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 392 BTIF_INFO_FUNC("--\n"); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 393 return 0; eca6cb9d1200e7 Frank Wunderlich 2021-07-12 394 } eca6cb9d1200e7 Frank Wunderlich 2021-07-12 395 :::::: The code at line 379 was first introduced by commit :::::: eca6cb9d1200e774a42a7dd581e3ce064081bdec mt6625l: add driver folder from 5.13 :::::: TO: Frank Wunderlich <frank-w(a)public-files.de&gt; :::::: CC: Frank Wunderlich <frank-w(a)public-files.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org