Hi Jindong, First bad commit (maybe != root cause): tree: https://github.com/Freescale/linux-fslc pr/490 head: e1744bcfc0ba973d84a580a510206e682c10cfcb commit: 5c690f143dd1d4a1c4fcbd013ee3d7d8388e1e6b [8696/15241] MA-17911 soc: imx: Allow IMX8M_BUSFREQ to be loadable as module config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 11.2.0 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/Freescale/linux-fslc/commit/5c690f143dd1d4a1c4fcbd013e... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc pr/490 git checkout 5c690f143dd1d4a1c4fcbd013ee3d7d8388e1e6b # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 304 | void request_bus_freq(enum bus_freq_mode mode) | ^~~~~~~~~~~~~~~~ In file included from drivers/soc/imx/busfreq-imx8mq.c:16: include/linux/busfreq-imx.h:58:20: note: previous definition of 'request_bus_freq' with type 'void(enum bus_freq_mode)' 58 | static inline void request_bus_freq(enum bus_freq_mode mode) | ^~~~~~~~~~~~~~~~ 340 | void release_bus_freq(enum bus_freq_mode mode) | ^~~~~~~~~~~~~~~~ In file included from drivers/soc/imx/busfreq-imx8mq.c:16: include/linux/busfreq-imx.h:61:20: note: previous definition of 'release_bus_freq' with type 'void(enum bus_freq_mode)' 61 | static inline void release_bus_freq(enum bus_freq_mode mode) | ^~~~~~~~~~~~~~~~ 393 | int get_bus_freq_mode(void) | ^~~~~~~~~~~~~~~~~ In file included from drivers/soc/imx/busfreq-imx8mq.c:16: include/linux/busfreq-imx.h:72:19: note: previous definition of 'get_bus_freq_mode' with type 'int(void)' 72 | static inline int get_bus_freq_mode(void) | ^~~~~~~~~~~~~~~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for RPMSG_VIRTIO Depends on HAS_DMA Selected by - HAVE_IMX_RPMSG && IMX_MBOX WARNING: unmet direct dependencies detected for SND_ATMEL_SOC_PDC Depends on SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && HAS_DMA Selected by - SND_ATMEL_SOC_SSC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC - SND_ATMEL_SOC_SSC_PDC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && ATMEL_SSC vim +/request_bus_freq +304 drivers/soc/imx/busfreq-imx8mq.c 43e127d4a2ffa1 Bai Ping 2017-10-30 303 43e127d4a2ffa1 Bai Ping 2017-10-30 @304 void request_bus_freq(enum bus_freq_mode mode) 43e127d4a2ffa1 Bai Ping 2017-10-30 305 { 43e127d4a2ffa1 Bai Ping 2017-10-30 306 mutex_lock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 307 43e127d4a2ffa1 Bai Ping 2017-10-30 308 if (mode == BUS_FREQ_HIGH) 43e127d4a2ffa1 Bai Ping 2017-10-30 309 high_bus_count++; 43e127d4a2ffa1 Bai Ping 2017-10-30 310 else if (mode == BUS_FREQ_AUDIO) 43e127d4a2ffa1 Bai Ping 2017-10-30 311 audio_bus_count++; 43e127d4a2ffa1 Bai Ping 2017-10-30 312 else if (mode == BUS_FREQ_LOW) 43e127d4a2ffa1 Bai Ping 2017-10-30 313 low_bus_count++; 43e127d4a2ffa1 Bai Ping 2017-10-30 314 43e127d4a2ffa1 Bai Ping 2017-10-30 315 if (busfreq_suspended || !bus_freq_scaling_initialized || 43e127d4a2ffa1 Bai Ping 2017-10-30 316 !bus_freq_scaling_is_active) { 43e127d4a2ffa1 Bai Ping 2017-10-30 317 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 318 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 319 } 43e127d4a2ffa1 Bai Ping 2017-10-30 320 43e127d4a2ffa1 Bai Ping 2017-10-30 321 cancel_low_bus_freq_handler(); 43e127d4a2ffa1 Bai Ping 2017-10-30 322 43e127d4a2ffa1 Bai Ping 2017-10-30 323 if ((mode == BUS_FREQ_HIGH) && (!high_bus_freq_mode)) { 43e127d4a2ffa1 Bai Ping 2017-10-30 324 set_high_bus_freq(1); 43e127d4a2ffa1 Bai Ping 2017-10-30 325 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 326 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 327 } 43e127d4a2ffa1 Bai Ping 2017-10-30 328 43e127d4a2ffa1 Bai Ping 2017-10-30 329 if ((mode == BUS_FREQ_AUDIO) && (!high_bus_freq_mode) && 43e127d4a2ffa1 Bai Ping 2017-10-30 330 (!audio_bus_freq_mode)) { 43e127d4a2ffa1 Bai Ping 2017-10-30 331 set_low_bus_freq(); 43e127d4a2ffa1 Bai Ping 2017-10-30 332 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 333 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 334 } 43e127d4a2ffa1 Bai Ping 2017-10-30 335 43e127d4a2ffa1 Bai Ping 2017-10-30 336 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 337 } 43e127d4a2ffa1 Bai Ping 2017-10-30 338 EXPORT_SYMBOL(request_bus_freq); 43e127d4a2ffa1 Bai Ping 2017-10-30 339 43e127d4a2ffa1 Bai Ping 2017-10-30 @340 void release_bus_freq(enum bus_freq_mode mode) 43e127d4a2ffa1 Bai Ping 2017-10-30 341 { 43e127d4a2ffa1 Bai Ping 2017-10-30 342 mutex_lock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 343 if (mode == BUS_FREQ_HIGH) { 43e127d4a2ffa1 Bai Ping 2017-10-30 344 if (high_bus_count == 0) { 43e127d4a2ffa1 Bai Ping 2017-10-30 345 dev_err(busfreq_dev, "high bus count mismatch!\n"); 43e127d4a2ffa1 Bai Ping 2017-10-30 346 dump_stack(); 43e127d4a2ffa1 Bai Ping 2017-10-30 347 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 348 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 349 } 43e127d4a2ffa1 Bai Ping 2017-10-30 350 high_bus_count--; 43e127d4a2ffa1 Bai Ping 2017-10-30 351 } else if (mode == BUS_FREQ_AUDIO) { 43e127d4a2ffa1 Bai Ping 2017-10-30 352 if (audio_bus_count == 0) { 43e127d4a2ffa1 Bai Ping 2017-10-30 353 dev_err(busfreq_dev, "audio bus count mismatch!\n"); 43e127d4a2ffa1 Bai Ping 2017-10-30 354 dump_stack(); 43e127d4a2ffa1 Bai Ping 2017-10-30 355 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 356 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 357 } 43e127d4a2ffa1 Bai Ping 2017-10-30 358 audio_bus_count--; 43e127d4a2ffa1 Bai Ping 2017-10-30 359 } else if (mode == BUS_FREQ_LOW) { 43e127d4a2ffa1 Bai Ping 2017-10-30 360 if (low_bus_count == 0) { 43e127d4a2ffa1 Bai Ping 2017-10-30 361 dev_err(busfreq_dev, "low bus count mismatch!\n"); 43e127d4a2ffa1 Bai Ping 2017-10-30 362 dump_stack(); 43e127d4a2ffa1 Bai Ping 2017-10-30 363 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 364 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 365 } 43e127d4a2ffa1 Bai Ping 2017-10-30 366 low_bus_count--; 43e127d4a2ffa1 Bai Ping 2017-10-30 367 } 43e127d4a2ffa1 Bai Ping 2017-10-30 368 43e127d4a2ffa1 Bai Ping 2017-10-30 369 if (busfreq_suspended || !bus_freq_scaling_initialized || 43e127d4a2ffa1 Bai Ping 2017-10-30 370 !bus_freq_scaling_is_active) { 43e127d4a2ffa1 Bai Ping 2017-10-30 371 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 372 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 373 } 43e127d4a2ffa1 Bai Ping 2017-10-30 374 43e127d4a2ffa1 Bai Ping 2017-10-30 375 if ((!audio_bus_freq_mode) && (high_bus_count == 0) && 43e127d4a2ffa1 Bai Ping 2017-10-30 376 (audio_bus_count != 0)) { 43e127d4a2ffa1 Bai Ping 2017-10-30 377 set_low_bus_freq(); 43e127d4a2ffa1 Bai Ping 2017-10-30 378 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 379 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 380 } 43e127d4a2ffa1 Bai Ping 2017-10-30 381 43e127d4a2ffa1 Bai Ping 2017-10-30 382 if ((!low_bus_freq_mode) && (high_bus_count == 0) && 43e127d4a2ffa1 Bai Ping 2017-10-30 383 (audio_bus_count == 0)) { 43e127d4a2ffa1 Bai Ping 2017-10-30 384 set_low_bus_freq(); 43e127d4a2ffa1 Bai Ping 2017-10-30 385 mutex_unlock(&bus_freq_mutex); 0e73ee47110db0 Bai Ping 2018-01-08 386 return; 43e127d4a2ffa1 Bai Ping 2017-10-30 387 } 43e127d4a2ffa1 Bai Ping 2017-10-30 388 43e127d4a2ffa1 Bai Ping 2017-10-30 389 mutex_unlock(&bus_freq_mutex); 43e127d4a2ffa1 Bai Ping 2017-10-30 390 } 43e127d4a2ffa1 Bai Ping 2017-10-30 391 EXPORT_SYMBOL(release_bus_freq); 43e127d4a2ffa1 Bai Ping 2017-10-30 392 43e127d4a2ffa1 Bai Ping 2017-10-30 @393 int get_bus_freq_mode(void) 43e127d4a2ffa1 Bai Ping 2017-10-30 394 { 43e127d4a2ffa1 Bai Ping 2017-10-30 395 return cur_bus_freq_mode; 43e127d4a2ffa1 Bai Ping 2017-10-30 396 } 43e127d4a2ffa1 Bai Ping 2017-10-30 397 EXPORT_SYMBOL(get_bus_freq_mode); 43e127d4a2ffa1 Bai Ping 2017-10-30 398 :::::: The code at line 304 was first introduced by commit :::::: 43e127d4a2ffa1fdad45da32c320035719feff90 MLK-16689-03 driver: soc: Add busfreq driver for imx8mq :::::: TO: Bai Ping <ping.bai(a)nxp.com&gt; :::::: CC: Dong Aisheng <aisheng.dong(a)nxp.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org