tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 9ae1fbdeabd3b3f668ad0bcb47d64b3a9fb4f8fc commit: ed229454856e565c5a7d3287cbc63f2cf077b34f [6417/11322] power: supply: axp288-charger: Optimize register reading method config: x86_64-randconfig-a004-20211004 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=ed229454856e565c5a7d3287cbc63f2cf077b34f git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout ed229454856e565c5a7d3287cbc63f2cf077b34f # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot Note: the linux-next/master HEAD 9ae1fbdeabd3b3f668ad0bcb47d64b3a9fb4f8fc builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): drivers/power/supply/axp288_charger.c: In function 'axp288_charger_usb_update_property': >> drivers/power/supply/axp288_charger.c:411:8: error: implicit declaration of function 'iosf_mbi_block_punit_i2c_access' [-Werror=implicit-function-declaration] 411 | ret = iosf_mbi_block_punit_i2c_access(); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/power/supply/axp288_charger.c:430:2: error: implicit declaration of function 'iosf_mbi_unblock_punit_i2c_access' [-Werror=implicit-function-declaration] 430 | iosf_mbi_unblock_punit_i2c_access(); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/iosf_mbi_block_punit_i2c_access +411 drivers/power/supply/axp288_charger.c 401 402 static int axp288_charger_usb_update_property(struct axp288_chrg_info *info) 403 { 404 int ret = 0; 405 406 if (info->valid && time_before(jiffies, info->last_updated + AXP288_REG_UPDATE_INTERVAL)) 407 return 0; 408 409 dev_dbg(&info->pdev->dev, "Charger updating register values...\n"); 410 > 411 ret = iosf_mbi_block_punit_i2c_access(); 412 if (ret < 0) 413 return ret; 414 415 ret = axp288_charger_reg_readb(info, AXP20X_PWR_INPUT_STATUS, &info->input_status); 416 if (ret < 0) 417 goto out; 418 419 ret = axp288_charger_reg_readb(info, AXP20X_PWR_OP_MODE, &info->op_mode); 420 if (ret < 0) 421 goto out; 422 423 ret = axp288_charger_reg_readb(info, AXP20X_CHRG_BAK_CTRL, &info->backend_control); 424 if (ret < 0) 425 goto out; 426 427 info->last_updated = jiffies; 428 info->valid = true; 429 out: > 430 iosf_mbi_unblock_punit_i2c_access(); 431 return ret; 432 } 433 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org