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-allyesconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 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 # 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=gcc-11.2.0 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 >>): In file included from drivers/misc/mediatek/btif/common/plat_inc/btif_pub.h:17, from drivers/misc/mediatek/btif/common/mtk_btif.c:37: drivers/misc/mediatek/btif/common/plat_inc/plat_common.h: In function 'hal_log_print': 64 | vsnprintf(temp_sring, DBG_LOG_STR_SIZE, str, args); | ^~~~~~~~~ drivers/misc/mediatek/btif/common/mtk_btif.c: In function 'mtk_btif_restore_noirq': 379 | int i_ret = 0; | ^~~~~ drivers/misc/mediatek/btif/common/mtk_btif.c: In function 'flag_store': 773 | int result = 0; | ^~~~~~ drivers/misc/mediatek/btif/common/mtk_btif.c: In function 'btif_log_buf_dmp_out': 3029 | unsigned char *p_buf = NULL; | ^~~~~ -- In file included from drivers/misc/mediatek/btif/common/plat_inc/btif_pub.h:17, from drivers/misc/mediatek/btif/common/inc/mtk_btif.h:37, from drivers/misc/mediatek/btif/common/mtk_btif_exp.c:20: drivers/misc/mediatek/btif/common/plat_inc/plat_common.h: In function 'hal_log_print': 64 | vsnprintf(temp_sring, DBG_LOG_STR_SIZE, str, args); | ^~~~~~~~~ -- In file included from drivers/misc/mediatek/btif/common/plat_inc/btif_dma_pub.h:19, from drivers/misc/mediatek/btif/common/plat_inc/btif_dma_priv.h:18, from drivers/misc/mediatek/btif/common/btif_dma_plat.c:22: drivers/misc/mediatek/btif/common/plat_inc/plat_common.h: In function 'hal_log_print': 64 | vsnprintf(temp_sring, DBG_LOG_STR_SIZE, str, args); | ^~~~~~~~~ drivers/misc/mediatek/btif/common/btif_dma_plat.c: In function 'hal_dma_pm_ops': 1313 | unsigned int flag = 0; | ^~~~ -- In file included from drivers/misc/mediatek/btif/common/plat_inc/btif_pub.h:17, from drivers/misc/mediatek/btif/common/btif_plat.c:21: drivers/misc/mediatek/btif/common/plat_inc/plat_common.h: In function 'hal_log_print': 64 | vsnprintf(temp_sring, DBG_LOG_STR_SIZE, str, args); | ^~~~~~~~~ drivers/misc/mediatek/btif/common/btif_plat.c: In function 'hal_btif_hw_init': 516 | hal_btif_tx_mode_ctrl(p_btif, false); | ^~~~~ drivers/misc/mediatek/btif/common/btif_plat.c:518:39: warning: implicit conversion from 'enum <anonymous>' to 'ENUM_BTIF_MODE' {aka 'enum _ENUM_BTIF_MODE_'} [-Wenum-conversion] 518 | hal_btif_rx_mode_ctrl(p_btif, false); | ^~~~~ drivers/misc/mediatek/btif/common/btif_plat.c: In function 'hal_btif_pm_ops': 1343 | unsigned int flag = 0; | ^~~~ vim +64 drivers/misc/mediatek/btif/common/plat_inc/plat_common.h eca6cb9d1200e7 Frank Wunderlich 2021-07-12 56 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 57 /*Log defination*/ eca6cb9d1200e7 Frank Wunderlich 2021-07-12 58 static int hal_log_print(const char *str, ...) eca6cb9d1200e7 Frank Wunderlich 2021-07-12 59 { eca6cb9d1200e7 Frank Wunderlich 2021-07-12 60 va_list args; eca6cb9d1200e7 Frank Wunderlich 2021-07-12 61 char temp_sring[DBG_LOG_STR_SIZE]; eca6cb9d1200e7 Frank Wunderlich 2021-07-12 62 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 63 va_start(args, str); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 @64 vsnprintf(temp_sring, DBG_LOG_STR_SIZE, str, args); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 65 va_end(args); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 66 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 67 pr_err("%s", temp_sring); eca6cb9d1200e7 Frank Wunderlich 2021-07-12 68 eca6cb9d1200e7 Frank Wunderlich 2021-07-12 69 return 0; eca6cb9d1200e7 Frank Wunderlich 2021-07-12 70 } eca6cb9d1200e7 Frank Wunderlich 2021-07-12 71 :::::: The code at line 64 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