Hi Zhang, url: https://github.com/0day-ci/linux/commits/Zhang-Rui/thermal-rename-thermal... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/acpi/processor_thermal.c:158 acpi_thermal_cpufreq_exit() error: we previously assumed 'pr' could be null (see line 156) # https://github.com/0day-ci/linux/commit/7d1c8f3879a36c7230c2842c651c4a3ce... git remote add linux-review https://github.com/0day-ci/linux git remote update linux-review git checkout 7d1c8f3879a36c7230c2842c651c4a3ce66b3d61 vim +/pr +158 drivers/acpi/processor_thermal.c 3000ce3c52f8b8 Rafael J. Wysocki 2019-10-16 149 void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy) 4be44fcd3bf648 Len Brown 2005-08-05 150 { a1bb46c36ce389 Rafael J. Wysocki 2019-10-25 151 unsigned int cpu; a1bb46c36ce389 Rafael J. Wysocki 2019-10-25 152 a1bb46c36ce389 Rafael J. Wysocki 2019-10-25 153 for_each_cpu(cpu, policy->related_cpus) { 3000ce3c52f8b8 Rafael J. Wysocki 2019-10-16 154 struct acpi_processor *pr = per_cpu(processors, policy->cpu); ^1da177e4c3f41 Linus Torvalds 2005-04-16 155 2d8b39a62a5d38 Rafael J. Wysocki 2019-10-15 @156 if (pr) ^^ Check 3000ce3c52f8b8 Rafael J. Wysocki 2019-10-16 157 freq_qos_remove_request(&pr->thermal_req); 7d1c8f3879a36c Zhang Rui 2020-04-08 @158 thermal_cdev_stats_update_max(pr->cdev); ^^^^^^^^ Unchecked dereference. ^1da177e4c3f41 Linus Torvalds 2005-04-16 159 } a1bb46c36ce389 Rafael J. Wysocki 2019-10-25 160 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 161 #else /* ! CONFIG_CPU_FREQ */ d9460fd227ed2c Zhang Rui 2008-01-17 162 static int cpufreq_get_max_state(unsigned int cpu) d9460fd227ed2c Zhang Rui 2008-01-17 163 { d9460fd227ed2c Zhang Rui 2008-01-17 164 return 0; d9460fd227ed2c Zhang Rui 2008-01-17 165 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org