Hi Junxiao, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 4.19/android head: 918b1786ca6f6f34c11a6038a2c2be6d54e1455e commit: 045c4cc9854e44be23f27501c397c8d1783a0708 [16527/19720] cpufreq statistics: support cpufreq driver without freq table config: arm-randconfig-r014-20210317 (attached as .config) compiler: arm-linux-gnueabi-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/intel/linux-intel-lts/commit/045c4cc9854e44be23f27501c... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 4.19/android git checkout 045c4cc9854e44be23f27501c397c8d1783a0708 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): 354 | int cpufreq_table_get_closed_index(int cpu, unsigned int freq) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 367 | void cpufreq_times_create_policy_no_freq_table(struct cpufreq_policy *policy) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/cpufreq/cpufreq_times.c:511:37: warning: 'uid_time_in_state_fops' defined but not used [-Wunused-const-variable=] 511 | static const struct file_operations uid_time_in_state_fops = { | ^~~~~~~~~~~~~~~~~~~~~~ vim +/cpufreq_table_get_closed_index +354 drivers/cpufreq/cpufreq_times.c 350 351 #define CPU_FREQ_STEPS 100000 352 // Suppose all cores have same freq count 353 static int all_freq_count; 355 { 356 int i; 357 unsigned int rounded_freq; 358 359 rounded_freq = freq + CPU_FREQ_STEPS / 2; 360 for (i = 0; i < all_freq_count; i++) { 361 if ((rounded_freq - all_freqs[cpu]->freq_table[i]) / CPU_FREQ_STEPS == 0) 362 return i; 363 } 364 return -1; 365 } 366 368 { 369 int cpu, index, i; 370 unsigned int count = 0; 371 struct cpu_freqs *freqs; 372 void *tmp; 373 374 if (all_freqs[policy->cpu]) 375 return; 376 377 count = (policy->max - policy->min) / CPU_FREQ_STEPS + 1; 378 if ((policy->max - policy->min) % CPU_FREQ_STEPS) 379 count++; 380 381 if (count > 100) 382 return; 383 384 tmp = kzalloc(sizeof(*freqs) + sizeof(freqs->freq_table[0]) * count, 385 GFP_KERNEL); 386 if (!tmp) 387 return; 388 389 freqs = tmp; 390 freqs->max_state = count; 391 all_freq_count = count; 392 393 freqs->freq_table[0] = policy->min; 394 freqs->freq_table[count - 1] = policy->max; 395 for (i = 1; i < count - 1; i++) 396 freqs->freq_table[i] = policy->min + i * CPU_FREQ_STEPS; 397 freqs->offset = next_offset; 398 WRITE_ONCE(next_offset, freqs->offset + count); 399 for_each_cpu(cpu, policy->related_cpus) 400 all_freqs[cpu] = freqs; 401 402 index = cpufreq_table_get_closed_index(policy->cpu, policy->cur); 403 if (index >= 0) 404 WRITE_ONCE(freqs->last_index, index); 405 } 406 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org