Hi Sudeep, I love your patch! Perhaps something to improve: [auto build test WARNING on rafael-pm/linux-next] [cannot apply to linux/master linus/master v5.17-rc3 next-20220208] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Sudeep-Holla/ACPI-PCC-Implement-... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220208/202202081845.I5Ieercg-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/1dbcdc47eadc8c55659410fc03d067f34... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sudeep-Holla/ACPI-PCC-Implement-OperationRegion-handler-for-the-PCC-Type-3-subtype/20220104-000003 git checkout 1dbcdc47eadc8c55659410fc03d067f3438a386a # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +/pcc_ctx +34 drivers/acpi/acpi_pcc.c 33 35 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org