Hi Jindong, First bad commit (maybe != root cause): tree: https://github.com/Freescale/linux-fslc pr/308 head: 8ad3d2ca53512dbb09a96c97d59595dea182e45a commit: d29c65632f73063945b8ab29a5634573959e8539 [14380/18175] MA-17597-2 mfd: pca9450: Support module build config: x86_64-randconfig-a004-20210415 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/Freescale/linux-fslc/commit/d29c65632f73063945b8ab29a5... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc pr/308 git checkout d29c65632f73063945b8ab29a5634573959e8539 # save the attached .config to linux build tree make W=1 W=1 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 errors (new ones prefixed by >>): drivers/regulator/pca9450-regulator.c: In function 'pca9450_probe': 678 | desc->name = pca9450_matches[i].name; | ^~~~~~~~~~~~~~~ drivers/regulator/pca9450-regulator.c:678:16: note: each undeclared identifier is reported only once for each function it appears in At top level: drivers/regulator/pca9450-regulator.c:149:44: warning: 'pca9450_ldo2_voltage_ranges' defined but not used [-Wunused-const-variable=] 149 | static const struct regulator_linear_range pca9450_ldo2_voltage_ranges[] = { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/pca9450_matches +678 drivers/regulator/pca9450-regulator.c c46712e52a8dd0 Robin Gong 2019-10-23 634 c46712e52a8dd0 Robin Gong 2019-10-23 635 /* c46712e52a8dd0 Robin Gong 2019-10-23 636 * @brief probe pca9450 regulator device c46712e52a8dd0 Robin Gong 2019-10-23 637 * @param pdev pca9450 regulator platform device c46712e52a8dd0 Robin Gong 2019-10-23 638 * @retval 0 success c46712e52a8dd0 Robin Gong 2019-10-23 639 * @retval negative fail c46712e52a8dd0 Robin Gong 2019-10-23 640 */ c46712e52a8dd0 Robin Gong 2019-10-23 641 static int pca9450_probe(struct platform_device *pdev) c46712e52a8dd0 Robin Gong 2019-10-23 642 { c46712e52a8dd0 Robin Gong 2019-10-23 643 struct pca9450_pmic *pmic; c46712e52a8dd0 Robin Gong 2019-10-23 644 struct pca9450_board *pdata; c46712e52a8dd0 Robin Gong 2019-10-23 645 struct regulator_config config = {}; c46712e52a8dd0 Robin Gong 2019-10-23 646 struct pca9450 *pca9450 = dev_get_drvdata(pdev->dev.parent); c46712e52a8dd0 Robin Gong 2019-10-23 647 struct of_regulator_match *matches = NULL; c46712e52a8dd0 Robin Gong 2019-10-23 648 int i = 0, err, irq = 0, ret = 0; c46712e52a8dd0 Robin Gong 2019-10-23 649 c46712e52a8dd0 Robin Gong 2019-10-23 650 pmic = kzalloc(sizeof(*pmic), GFP_KERNEL); c46712e52a8dd0 Robin Gong 2019-10-23 651 if (!pmic) c46712e52a8dd0 Robin Gong 2019-10-23 652 return -ENOMEM; c46712e52a8dd0 Robin Gong 2019-10-23 653 c46712e52a8dd0 Robin Gong 2019-10-23 654 memcpy(pmic->descs, pca9450_regulators, sizeof(pmic->descs)); c46712e52a8dd0 Robin Gong 2019-10-23 655 c46712e52a8dd0 Robin Gong 2019-10-23 656 pmic->dev = &pdev->dev; c46712e52a8dd0 Robin Gong 2019-10-23 657 pmic->mfd = pca9450; c46712e52a8dd0 Robin Gong 2019-10-23 658 platform_set_drvdata(pdev, pmic); c46712e52a8dd0 Robin Gong 2019-10-23 659 pdata = dev_get_platdata(pca9450->dev); c46712e52a8dd0 Robin Gong 2019-10-23 660 c46712e52a8dd0 Robin Gong 2019-10-23 661 if (!pdata && pca9450->dev->of_node) { c46712e52a8dd0 Robin Gong 2019-10-23 662 pca9450_parse_dt_reg_data(pdev, &matches); c46712e52a8dd0 Robin Gong 2019-10-23 663 if (matches == NULL) { c46712e52a8dd0 Robin Gong 2019-10-23 664 dev_err(&pdev->dev, "Platform data not found\n"); c46712e52a8dd0 Robin Gong 2019-10-23 665 return -EINVAL; c46712e52a8dd0 Robin Gong 2019-10-23 666 } c46712e52a8dd0 Robin Gong 2019-10-23 667 } c46712e52a8dd0 Robin Gong 2019-10-23 668 c46712e52a8dd0 Robin Gong 2019-10-23 669 /* Get buck dvs parameters */ c46712e52a8dd0 Robin Gong 2019-10-23 670 of_pca9450_buck_dvs(pdev, &pmic->buck_dvs[0]); c46712e52a8dd0 Robin Gong 2019-10-23 671 c46712e52a8dd0 Robin Gong 2019-10-23 672 for (i = 0; i < PCA9450_REGULATOR_CNT; i++) { c46712e52a8dd0 Robin Gong 2019-10-23 673 struct regulator_init_data *init_data; c46712e52a8dd0 Robin Gong 2019-10-23 674 struct regulator_desc *desc; c46712e52a8dd0 Robin Gong 2019-10-23 675 struct regulator_dev *rdev; c46712e52a8dd0 Robin Gong 2019-10-23 676 c46712e52a8dd0 Robin Gong 2019-10-23 677 desc = &pmic->descs[i]; c46712e52a8dd0 Robin Gong 2019-10-23 @678 desc->name = pca9450_matches[i].name; c46712e52a8dd0 Robin Gong 2019-10-23 679 c46712e52a8dd0 Robin Gong 2019-10-23 680 if (pdata) c46712e52a8dd0 Robin Gong 2019-10-23 681 init_data = pdata->init_data[i]; c46712e52a8dd0 Robin Gong 2019-10-23 682 else c46712e52a8dd0 Robin Gong 2019-10-23 683 init_data = pca9450_matches[i].init_data; c46712e52a8dd0 Robin Gong 2019-10-23 684 c46712e52a8dd0 Robin Gong 2019-10-23 685 config.dev = pmic->dev; c46712e52a8dd0 Robin Gong 2019-10-23 686 config.init_data = init_data; c46712e52a8dd0 Robin Gong 2019-10-23 687 config.driver_data = pmic; c46712e52a8dd0 Robin Gong 2019-10-23 688 config.regmap = pca9450->regmap; c46712e52a8dd0 Robin Gong 2019-10-23 689 if (matches) c46712e52a8dd0 Robin Gong 2019-10-23 690 config.of_node = matches[i].of_node; c46712e52a8dd0 Robin Gong 2019-10-23 691 dev_dbg(config.dev, "regulator register name '%s'\n", c46712e52a8dd0 Robin Gong 2019-10-23 692 desc->name); c46712e52a8dd0 Robin Gong 2019-10-23 693 c46712e52a8dd0 Robin Gong 2019-10-23 694 rdev = regulator_register(desc, &config); c46712e52a8dd0 Robin Gong 2019-10-23 695 if (IS_ERR(rdev)) { c46712e52a8dd0 Robin Gong 2019-10-23 696 dev_err(pca9450->dev, c46712e52a8dd0 Robin Gong 2019-10-23 697 "failed to register %s regulator\n", c46712e52a8dd0 Robin Gong 2019-10-23 698 desc->name); c46712e52a8dd0 Robin Gong 2019-10-23 699 err = PTR_ERR(rdev); c46712e52a8dd0 Robin Gong 2019-10-23 700 goto err; c46712e52a8dd0 Robin Gong 2019-10-23 701 } c46712e52a8dd0 Robin Gong 2019-10-23 702 pmic->rdev[i] = rdev; c46712e52a8dd0 Robin Gong 2019-10-23 703 } c46712e52a8dd0 Robin Gong 2019-10-23 704 c46712e52a8dd0 Robin Gong 2019-10-23 705 /* Init sysfs registers */ c46712e52a8dd0 Robin Gong 2019-10-23 706 pmic->reg_index = -1; c46712e52a8dd0 Robin Gong 2019-10-23 707 c46712e52a8dd0 Robin Gong 2019-10-23 708 err = sysfs_create_group(&pdev->dev.kobj, &clk_attr_group); c46712e52a8dd0 Robin Gong 2019-10-23 709 if (err != 0) { c46712e52a8dd0 Robin Gong 2019-10-23 710 dev_err(&pdev->dev, "Failed to create sysfs: %d\n", err); c46712e52a8dd0 Robin Gong 2019-10-23 711 goto err; c46712e52a8dd0 Robin Gong 2019-10-23 712 } c46712e52a8dd0 Robin Gong 2019-10-23 713 c46712e52a8dd0 Robin Gong 2019-10-23 714 /* Init Buck1/2/3 dvs */ c46712e52a8dd0 Robin Gong 2019-10-23 715 err = pca9450_buck123_dvs_init(pmic); c46712e52a8dd0 Robin Gong 2019-10-23 716 if (err != 0) { c46712e52a8dd0 Robin Gong 2019-10-23 717 dev_err(&pdev->dev, "Failed to buck123 dvs: %d\n", err); c46712e52a8dd0 Robin Gong 2019-10-23 718 goto err; c46712e52a8dd0 Robin Gong 2019-10-23 719 } c46712e52a8dd0 Robin Gong 2019-10-23 720 c46712e52a8dd0 Robin Gong 2019-10-23 721 /* Add Interrupt */ c46712e52a8dd0 Robin Gong 2019-10-23 722 irq = platform_get_irq(pdev, 0); c46712e52a8dd0 Robin Gong 2019-10-23 723 if (irq <= 0) { c46712e52a8dd0 Robin Gong 2019-10-23 724 dev_warn(&pdev->dev, "platform irq error # %d\n", irq); c46712e52a8dd0 Robin Gong 2019-10-23 725 return -ENXIO; c46712e52a8dd0 Robin Gong 2019-10-23 726 } c46712e52a8dd0 Robin Gong 2019-10-23 727 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, c46712e52a8dd0 Robin Gong 2019-10-23 728 pca9450_pmic_interrupt, c46712e52a8dd0 Robin Gong 2019-10-23 729 IRQF_TRIGGER_LOW | IRQF_EARLY_RESUME, c46712e52a8dd0 Robin Gong 2019-10-23 730 dev_name(&pdev->dev), &pdev->dev); c46712e52a8dd0 Robin Gong 2019-10-23 731 if (ret < 0) c46712e52a8dd0 Robin Gong 2019-10-23 732 dev_err(&pdev->dev, "IRQ %d is not free.\n", irq); c46712e52a8dd0 Robin Gong 2019-10-23 733 c46712e52a8dd0 Robin Gong 2019-10-23 734 /* Un-mask IRQ Interrupt */ c46712e52a8dd0 Robin Gong 2019-10-23 735 ret = pca9450_reg_write(pca9450, PCA9450_INT1_MSK, 0); c46712e52a8dd0 Robin Gong 2019-10-23 736 if (ret < 0) { c46712e52a8dd0 Robin Gong 2019-10-23 737 dev_err(&pdev->dev, "Write 'PCA9450_REG_MIRQ': failed!\n"); c46712e52a8dd0 Robin Gong 2019-10-23 738 ret = -EIO; c46712e52a8dd0 Robin Gong 2019-10-23 739 goto err; c46712e52a8dd0 Robin Gong 2019-10-23 740 } c46712e52a8dd0 Robin Gong 2019-10-23 741 c46712e52a8dd0 Robin Gong 2019-10-23 742 return 0; c46712e52a8dd0 Robin Gong 2019-10-23 743 c46712e52a8dd0 Robin Gong 2019-10-23 744 err: c46712e52a8dd0 Robin Gong 2019-10-23 745 while (--i >= 0) c46712e52a8dd0 Robin Gong 2019-10-23 746 regulator_unregister(pmic->rdev[i]); c46712e52a8dd0 Robin Gong 2019-10-23 747 c46712e52a8dd0 Robin Gong 2019-10-23 748 kfree(pmic); c46712e52a8dd0 Robin Gong 2019-10-23 749 return err; c46712e52a8dd0 Robin Gong 2019-10-23 750 } c46712e52a8dd0 Robin Gong 2019-10-23 751 :::::: The code at line 678 was first introduced by commit :::::: c46712e52a8dd0ecce6efbd2d2d56919352478a9 MLK-22824-2: regulator: pca9450: add pca9450 regulator driver :::::: TO: Robin Gong <yibin.gong(a)nxp.com&gt; :::::: CC: Robin Gong <yibin.gong(a)nxp.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org