tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10 head: a34fc0a18f7e71d743c7231ef8186bf3779b5b11 commit: 121d08a011e0315614d6f9018585815c5fab305c [9551/9999] UPSTREAM: cpufreq: intel_pstate: Process HWP Guaranteed change notification config: x86_64-randconfig-s022 (https://download.01.org/0day-ci/archive/20220117/202201171020.cDwgFpX4-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.10 git checkout 121d08a011e0315614d6f9018585815c5fab305c # 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 drivers/cpufreq/ 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 +/notify_hwp_interrupt +1484 drivers/cpufreq/intel_pstate.c 1483 1485 { 1486 unsigned int this_cpu = smp_processor_id(); 1487 struct cpudata *cpudata; 1488 unsigned long flags; 1489 u64 value; 1490 1491 if (!READ_ONCE(hwp_active) || !boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) 1492 return; 1493 1494 rdmsrl_safe(MSR_HWP_STATUS, &value); 1495 if (!(value & 0x01)) 1496 return; 1497 1498 spin_lock_irqsave(&hwp_notify_lock, flags); 1499 1500 if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask)) 1501 goto ack_intr; 1502 1503 /* 1504 * Currently we never free all_cpu_data. And we can't reach here 1505 * without this allocated. But for safety for future changes, added 1506 * check. 1507 */ 1508 if (unlikely(!READ_ONCE(all_cpu_data))) 1509 goto ack_intr; 1510 1511 /* 1512 * The free is done during cleanup, when cpufreq registry is failed. 1513 * We wouldn't be here if it fails on init or switch status. But for 1514 * future changes, added check. 1515 */ 1516 cpudata = READ_ONCE(all_cpu_data[this_cpu]); 1517 if (unlikely(!cpudata)) 1518 goto ack_intr; 1519 1520 schedule_delayed_work(&cpudata->hwp_notify_work, msecs_to_jiffies(10)); 1521 1522 spin_unlock_irqrestore(&hwp_notify_lock, flags); 1523 1524 return; 1525 1526 ack_intr: 1527 wrmsrl_safe(MSR_HWP_STATUS, 0); 1528 spin_unlock_irqrestore(&hwp_notify_lock, flags); 1529 } 1530 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org