tree: https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x8... review-hans head: b1341d3e93b26a85bb765f7eddd717d409bc1ef8 commit: 05c8d91f374b5dceeb322221eca48077005b1686 [60/78] platform/x86: intel_scu: Move to intel sub-directory config: i386-randconfig-m021-20210819 (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/pdx86/platform-drivers-x8... git remote add linux-platform-drivers-x86 https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x8... git fetch --no-tags linux-platform-drivers-x86 review-hans git checkout 05c8d91f374b5dceeb322221eca48077005b1686 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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 >>): ld: drivers/mfd/intel_pmc_bxt.o: in function `simplecmd_store': drivers/mfd/intel_pmc_bxt.c:181: undefined reference to `intel_scu_ipc_dev_simple_command' ld: drivers/mfd/intel_pmc_bxt.o: in function `northpeak_store': drivers/mfd/intel_pmc_bxt.c:221: undefined reference to `intel_scu_ipc_dev_simple_command' ld: drivers/mfd/intel_pmc_bxt.o: in function `intel_pmc_probe': drivers/mfd/intel_pmc_bxt.c:442: undefined reference to `__devm_intel_scu_ipc_register' ld: drivers/mfd/intel_soc_pmic_bxtwc.o: in function `intel_scu_ipc_dev_command': ld: drivers/mfd/intel_soc_pmic_bxtwc.o: in function `bxtwc_probe': vim +64 arch/x86/include/asm/intel_scu_ipc.h f57fa18583f538 Mika Westerberg 2020-04-16 41 f57fa18583f538 Mika Westerberg 2020-04-16 42 int intel_scu_ipc_dev_ioread8(struct intel_scu_ipc_dev *scu, u16 addr, f57fa18583f538 Mika Westerberg 2020-04-16 43 u8 *data); f57fa18583f538 Mika Westerberg 2020-04-16 44 int intel_scu_ipc_dev_iowrite8(struct intel_scu_ipc_dev *scu, u16 addr, f57fa18583f538 Mika Westerberg 2020-04-16 45 u8 data); f57fa18583f538 Mika Westerberg 2020-04-16 46 int intel_scu_ipc_dev_readv(struct intel_scu_ipc_dev *scu, u16 *addr, f57fa18583f538 Mika Westerberg 2020-04-16 47 u8 *data, size_t len); f57fa18583f538 Mika Westerberg 2020-04-16 48 int intel_scu_ipc_dev_writev(struct intel_scu_ipc_dev *scu, u16 *addr, f57fa18583f538 Mika Westerberg 2020-04-16 49 u8 *data, size_t len); f57fa18583f538 Mika Westerberg 2020-04-16 50 f57fa18583f538 Mika Westerberg 2020-04-16 51 int intel_scu_ipc_dev_update(struct intel_scu_ipc_dev *scu, u16 addr, f57fa18583f538 Mika Westerberg 2020-04-16 52 u8 data, u8 mask); f57fa18583f538 Mika Westerberg 2020-04-16 53 f57fa18583f538 Mika Westerberg 2020-04-16 54 int intel_scu_ipc_dev_simple_command(struct intel_scu_ipc_dev *scu, int cmd, f57fa18583f538 Mika Westerberg 2020-04-16 55 int sub); f57fa18583f538 Mika Westerberg 2020-04-16 56 int intel_scu_ipc_dev_command_with_size(struct intel_scu_ipc_dev *scu, int cmd, f57fa18583f538 Mika Westerberg 2020-04-16 57 int sub, const void *in, size_t inlen, f57fa18583f538 Mika Westerberg 2020-04-16 58 size_t size, void *out, size_t outlen); f57fa18583f538 Mika Westerberg 2020-04-16 59 f57fa18583f538 Mika Westerberg 2020-04-16 60 static inline int intel_scu_ipc_dev_command(struct intel_scu_ipc_dev *scu, int cmd, f57fa18583f538 Mika Westerberg 2020-04-16 61 int sub, const void *in, size_t inlen, f57fa18583f538 Mika Westerberg 2020-04-16 62 void *out, size_t outlen) f57fa18583f538 Mika Westerberg 2020-04-16 63 { f57fa18583f538 Mika Westerberg 2020-04-16 @64 return intel_scu_ipc_dev_command_with_size(scu, cmd, sub, in, inlen, f57fa18583f538 Mika Westerberg 2020-04-16 65 inlen, out, outlen); f57fa18583f538 Mika Westerberg 2020-04-16 66 } 54b34aa0a7295c Mika Westerberg 2020-04-16 67 :::::: The code at line 64 was first introduced by commit :::::: f57fa18583f538786b66a045446617f5638f032a platform/x86: intel_scu_ipc: Introduce new SCU IPC API :::::: TO: Mika Westerberg <mika.westerberg(a)linux.intel.com&gt; :::::: CC: Lee Jones <lee.jones(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org