tree: https://github.com/frank-w/BPI-R2-4.14 5.13-rc head: acf147972a65a0e50a52b63d878ed586649fad08 commit: 7a714edb2db6084dfa08ee66ee046d63ffc2b7ec [6/18] mt6625l: include wifi-code config: arm-allyesconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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/7a714edb2db6084dfa08ee66ee0... 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 5.13-rc git checkout 7a714edb2db6084dfa08ee66ee046d63ffc2b7ec # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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_pm_ops': 1343 | unsigned int flag = 0; | ^~~~ vim +64 drivers/misc/mediatek/btif/common/plat_inc/plat_common.h 30ea711f24a8bf Frank Wunderlich 2021-05-10 56 30ea711f24a8bf Frank Wunderlich 2021-05-10 57 /*Log defination*/ 30ea711f24a8bf Frank Wunderlich 2021-05-10 58 static int hal_log_print(const char *str, ...) 30ea711f24a8bf Frank Wunderlich 2021-05-10 59 { 30ea711f24a8bf Frank Wunderlich 2021-05-10 60 va_list args; 30ea711f24a8bf Frank Wunderlich 2021-05-10 61 char temp_sring[DBG_LOG_STR_SIZE]; 30ea711f24a8bf Frank Wunderlich 2021-05-10 62 30ea711f24a8bf Frank Wunderlich 2021-05-10 63 va_start(args, str); 30ea711f24a8bf Frank Wunderlich 2021-05-10 @64 vsnprintf(temp_sring, DBG_LOG_STR_SIZE, str, args); 30ea711f24a8bf Frank Wunderlich 2021-05-10 65 va_end(args); 30ea711f24a8bf Frank Wunderlich 2021-05-10 66 30ea711f24a8bf Frank Wunderlich 2021-05-10 67 pr_err("%s", temp_sring); 30ea711f24a8bf Frank Wunderlich 2021-05-10 68 30ea711f24a8bf Frank Wunderlich 2021-05-10 69 return 0; 30ea711f24a8bf Frank Wunderlich 2021-05-10 70 } 30ea711f24a8bf Frank Wunderlich 2021-05-10 71 :::::: The code at line 64 was first introduced by commit :::::: 30ea711f24a8bfd7c230e2db7d4aa23572592a15 mt6625l: add driver-code from 5.12 :::::: 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