tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: 7a821854911e315d3ed3fe2fc626e12906c9ab24 commit: 2948bbdc34f98909857c23acd79584143ea9e0b3 [1/5] ptp: S/W workaround for PMC TGPIO h/w bug config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/intel/linux-intel-lts/commit/2948bbdc34f98909857c23acd... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout 2948bbdc34f98909857c23acd79584143ea9e0b3 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): drivers/ptp/ptp-intel-pmc-tgpio.c: In function 'intel_pmc_tgpio_counttstamp': 484 | static struct timespec64 dt_ts_prev[2] = {0, 0}; | ^ | { } At top level: drivers/ptp/ptp-intel-pmc-tgpio.c:754:36: warning: 'intel_pmc_acpi_match' defined but not used [-Wunused-const-variable=] 754 | static const struct acpi_device_id intel_pmc_acpi_match[] = { | ^~~~~~~~~~~~~~~~~~~~ vim +484 drivers/ptp/ptp-intel-pmc-tgpio.c 473 474 static int intel_pmc_tgpio_counttstamp 475 (struct ptp_clock_info *info, struct ptp_event_count_tstamp *count) 476 { 477 struct intel_pmc_tgpio_t *tgpio = to_intel_pmc_tgpio(info); 478 u32 dt_hi_s; 479 u32 dt_hi_e; 480 u32 dt_lo; 481 struct timespec64 dt_ts; 482 struct timespec64 tsc_now; 483 static u32 dt_lo_prev[2] = {0, 0}; 485 static unsigned long long prev_count[2] = {0, 0}; 486 487 mutex_lock(&intel_pmc_tgpio->lock); 488 while (intel_pmc_tgpio->pin[count->index].busy) { 489 mutex_unlock(&intel_pmc_tgpio->lock); 490 wait_for_completion 491 (&intel_pmc_tgpio->pin[count->index].transact_comp); 492 mutex_lock(&intel_pmc_tgpio->lock); 493 } 494 intel_pmc_tgpio->pin[count->index].busy = true; 495 mutex_unlock(&intel_pmc_tgpio->lock); 496 497 tsc_now = get_tsc_ns_now(NULL); 498 dt_hi_s = convert_tsc_ns_to_art(&tsc_now) >> 32; 499 500 /* Reading lower 32-bit word of Time Capture Value (TCV) loads */ 501 /* the event time and event count capture */ 502 dt_lo = INTEL_PMC_TGPIO_RD_REG(TGPIOTCV31_0, count->index); 503 count->event_count = 504 INTEL_PMC_TGPIO_RD_REG(TGPIOECCV63_32, count->index); 505 count->event_count <<= 32; 506 count->event_count |= 507 INTEL_PMC_TGPIO_RD_REG(TGPIOECCV31_0, count->index); 508 dt_hi_e = INTEL_PMC_TGPIO_RD_REG(TGPIOTCV63_32, count->index); 509 510 if (dt_hi_e != dt_hi_s && dt_lo >> 31) 511 dt_ts = convert_art_to_tsc_ns(((u64)dt_hi_s << 32) | dt_lo); 512 else 513 dt_ts = convert_art_to_tsc_ns(((u64)dt_hi_e << 32) | dt_lo); 514 515 /* Return previous device time if the event_count 516 * isn't incremented with TCV value 517 */ 518 if (count->event_count == prev_count[count->index] || 519 dt_lo_prev[count->index] == dt_lo) { 520 count->event_count = prev_count[count->index]; 521 dt_lo = dt_lo_prev[count->index]; 522 dt_ts = dt_ts_prev[count->index]; 523 } 524 525 count->device_time = ts64_to_ptp_clock_time(dt_ts); 526 prev_count[count->index] = count->event_count; 527 dt_lo_prev[count->index] = dt_lo; 528 dt_ts_prev[count->index] = dt_ts; 529 530 mutex_lock(&intel_pmc_tgpio->lock); 531 intel_pmc_tgpio->pin[count->index].busy = false; 532 complete(&intel_pmc_tgpio->pin[count->index].transact_comp); 533 mutex_unlock(&intel_pmc_tgpio->lock); 534 535 return 0; 536 } 537 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org