Hi Will, I love your patch! Perhaps something to improve: [auto build test WARNING on arm/for-next] [also build test WARNING on soc/for-next xlnx/master kvmarm/next] [cannot apply to arm64/for-next/core v5.10-rc4 next-20201119] [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/Will-Deacon/arm64-Fix-issues-wit... base: git://git.armlinux.org.uk/~rmk/linux-arm.git for-next config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/b994fd4f2e7cee6f64d38036bd76c6c96... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Will-Deacon/arm64-Fix-issues-with-CPU-hotplug-and-RCU/20201109-092901 git checkout b994fd4f2e7cee6f64d38036bd76c6c9644cd2b1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): arch/arm64/kernel/psci.c: In function 'cpu_psci_cpu_die': 69 | int ret; | ^~~ vim +/ret +69 arch/arm64/kernel/psci.c 831ccf79b46e02f Mark Rutland 2013-10-24 66 831ccf79b46e02f Mark Rutland 2013-10-24 67 static void cpu_psci_cpu_die(unsigned int cpu) 831ccf79b46e02f Mark Rutland 2013-10-24 68 { 831ccf79b46e02f Mark Rutland 2013-10-24 @69 int ret; 831ccf79b46e02f Mark Rutland 2013-10-24 70 /* 831ccf79b46e02f Mark Rutland 2013-10-24 71 * There are no known implementations of PSCI actually using the 831ccf79b46e02f Mark Rutland 2013-10-24 72 * power state field, pass a sensible default for now. 831ccf79b46e02f Mark Rutland 2013-10-24 73 */ c8cc42737788537 Mark Rutland 2015-04-30 74 u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN << c8cc42737788537 Mark Rutland 2015-04-30 75 PSCI_0_2_POWER_STATE_TYPE_SHIFT; 831ccf79b46e02f Mark Rutland 2013-10-24 76 831ccf79b46e02f Mark Rutland 2013-10-24 77 ret = psci_ops.cpu_off(state); 831ccf79b46e02f Mark Rutland 2013-10-24 78 } c814ca029e1015b Ashwin Chaugule 2014-05-07 79 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org