Hi "周琰杰, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on tip/timers/core linus/master v5.7-rc5] [cannot apply to linux/master next-20200512] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Zhou-Yanjie/Introduce-SMP-suppor... base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/bitops.h:5:0, from drivers/clocksource/ingenic-timer.c:8: drivers/clocksource/ingenic-timer.c: In function 'ingenic_tcu_init': (((~UL(0)) - (UL(1) << (l)) + 1) & ^ (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) ^~~~~~~~~ tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1, ^~~~~~~ vim +/GENMASK +313 drivers/clocksource/ingenic-timer.c 288 289 static int __init ingenic_tcu_init(struct device_node *np) 290 { 291 const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np); 292 const struct ingenic_soc_info *soc_info = id->data; 293 struct ingenic_tcu *tcu; 294 struct regmap *map; 295 unsigned cpu = 0; 296 long rate; 297 int ret; 298 299 of_node_clear_flag(np, OF_POPULATED); 300 301 map = device_node_to_regmap(np); 302 if (IS_ERR(map)) 303 return PTR_ERR(map); 304 305 tcu = kzalloc(sizeof(*tcu), GFP_KERNEL); 306 if (!tcu) 307 return -ENOMEM; 308 309 /* 310 * Enable all TCU channels for PWM use by default except channels 0/1, 311 * and channel 2 if target CPU is JZ4780 and SMP is selected. 312 */ 314 NR_CPUS + 1); 315 of_property_read_u32(np, "ingenic,pwm-channels-mask", 316 (u32 *)&tcu->pwm_channels_mask); 317 318 /* Verify that we have at least NR_CPUS + 1 free channels */ 319 if (hweight8(tcu->pwm_channels_mask) > 320 soc_info->num_channels - NR_CPUS + 1) { 321 pr_crit("%s: Invalid PWM channel mask: 0x%02lx\n", __func__, 322 tcu->pwm_channels_mask); 323 ret = -EINVAL; 324 goto err_free_ingenic_tcu; 325 } 326 327 tcu->map = map; 328 tcu->np = np; 329 ingenic_tcu = tcu; 330 331 tcu->timer_local[cpu] = find_first_zero_bit(&tcu->pwm_channels_mask, 332 soc_info->num_channels); 333 334 for (cpu = 1; cpu < NR_CPUS; cpu++) 335 tcu->timer_local[cpu] = find_next_zero_bit( 336 &tcu->pwm_channels_mask, soc_info->num_channels, 337 tcu->timer_local[cpu - 1] + 1); 338 339 tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask, 340 soc_info->num_channels, tcu->timer_local[cpu - 1] + 1); 341 342 ret = ingenic_tcu_clocksource_init(np, tcu); 343 if (ret) { 344 pr_crit("%s: Unable to init clocksource: %d\n", __func__, ret); 345 goto err_free_ingenic_tcu; 346 } 347 348 /* Setup clock events on each CPU core */ 349 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "Ingenic XBurst: online", 350 ingenic_tcu_setup_cevt, NULL); 351 WARN_ON(ret < 0); 352 353 /* Register the sched_clock at the end as there's no way to undo it */ 354 rate = clk_get_rate(tcu->cs_clk); 355 sched_clock_register(ingenic_tcu_timer_read, 16, rate); 356 357 return 0; 358 359 err_free_ingenic_tcu: 360 kfree(tcu); 361 return ret; 362 } 363 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org