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-m021-20210818 (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': 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': Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for INTEL_SCU_IPC Depends on X86 && X86_PLATFORM_DEVICES && X86_PLATFORM_DRIVERS_INTEL Selected by - MFD_INTEL_PMC_BXT && HAS_IOMEM && X86 && X86_PLATFORM_DEVICES && ACPI vim +181 drivers/mfd/intel_pmc_bxt.c 25f1ca31e23059 Mika Westerberg 2020-04-16 152 25f1ca31e23059 Mika Westerberg 2020-04-16 153 /** 25f1ca31e23059 Mika Westerberg 2020-04-16 154 * simplecmd_store() - Send a simple IPC command 25f1ca31e23059 Mika Westerberg 2020-04-16 155 * @dev: Device under the attribute is 25f1ca31e23059 Mika Westerberg 2020-04-16 156 * @attr: Attribute in question 25f1ca31e23059 Mika Westerberg 2020-04-16 157 * @buf: Buffer holding data to be stored to the attribute 25f1ca31e23059 Mika Westerberg 2020-04-16 158 * @count: Number of bytes in @buf 25f1ca31e23059 Mika Westerberg 2020-04-16 159 * 25f1ca31e23059 Mika Westerberg 2020-04-16 160 * Expects a string with two integers separated with space. These two 25f1ca31e23059 Mika Westerberg 2020-04-16 161 * values hold command and subcommand that is send to PMC. 25f1ca31e23059 Mika Westerberg 2020-04-16 162 * 25f1ca31e23059 Mika Westerberg 2020-04-16 163 * Return: Number number of bytes written (@count) or negative errno in 25f1ca31e23059 Mika Westerberg 2020-04-16 164 * case of error. 25f1ca31e23059 Mika Westerberg 2020-04-16 165 */ 25f1ca31e23059 Mika Westerberg 2020-04-16 166 static ssize_t simplecmd_store(struct device *dev, struct device_attribute *attr, 25f1ca31e23059 Mika Westerberg 2020-04-16 167 const char *buf, size_t count) 25f1ca31e23059 Mika Westerberg 2020-04-16 168 { 25f1ca31e23059 Mika Westerberg 2020-04-16 169 struct intel_pmc_dev *pmc = dev_get_drvdata(dev); 25f1ca31e23059 Mika Westerberg 2020-04-16 170 struct intel_scu_ipc_dev *scu = pmc->scu; 25f1ca31e23059 Mika Westerberg 2020-04-16 171 int subcmd; 25f1ca31e23059 Mika Westerberg 2020-04-16 172 int cmd; 25f1ca31e23059 Mika Westerberg 2020-04-16 173 int ret; 25f1ca31e23059 Mika Westerberg 2020-04-16 174 25f1ca31e23059 Mika Westerberg 2020-04-16 175 ret = sscanf(buf, "%d %d", &cmd, &subcmd); 25f1ca31e23059 Mika Westerberg 2020-04-16 176 if (ret != 2) { 25f1ca31e23059 Mika Westerberg 2020-04-16 177 dev_err(dev, "Invalid values, expected: cmd subcmd\n"); 25f1ca31e23059 Mika Westerberg 2020-04-16 178 return -EINVAL; 25f1ca31e23059 Mika Westerberg 2020-04-16 179 } 25f1ca31e23059 Mika Westerberg 2020-04-16 180 25f1ca31e23059 Mika Westerberg 2020-04-16 @181 ret = intel_scu_ipc_dev_simple_command(scu, cmd, subcmd); 25f1ca31e23059 Mika Westerberg 2020-04-16 182 if (ret) 25f1ca31e23059 Mika Westerberg 2020-04-16 183 return ret; 25f1ca31e23059 Mika Westerberg 2020-04-16 184 25f1ca31e23059 Mika Westerberg 2020-04-16 185 return count; 25f1ca31e23059 Mika Westerberg 2020-04-16 186 } 25f1ca31e23059 Mika Westerberg 2020-04-16 187 static DEVICE_ATTR_WO(simplecmd); 25f1ca31e23059 Mika Westerberg 2020-04-16 188 :::::: The code at line 181 was first introduced by commit :::::: 25f1ca31e230598eaf3c38d387a355a64bd772a7 platform/x86: intel_pmc_ipc: Convert to MFD :::::: 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