tree: https://gitlab.freedesktop.org/agd5f/linux.git s0ix-8 head: 050ed943b1107b59b68db42e0c50586ea5055ce8 commit: 026d186e4592c1ee9c1cb44295912d0294508725 [207/212] ACPI / idle: override and update c-state latency when not conformance with s0ix config: i386-randconfig-m021-20210413 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; New smatch warnings: drivers/acpi/processor_idle.c:435 acpi_processor_power_verify() error: uninitialized symbol 'latency2'. drivers/acpi/processor_idle.c:435 acpi_processor_power_verify() error: uninitialized symbol 'latency3'. Old smatch warnings: drivers/acpi/processor_idle.c:77 set_max_cstate() warn: argument 3 to %ld specifier is cast from pointer vim +/latency2 +435 drivers/acpi/processor_idle.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 395 static int acpi_processor_power_verify(struct acpi_processor *pr) ^1da177e4c3f41 Linus Torvalds 2005-04-16 396 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 397 unsigned int i; ^1da177e4c3f41 Linus Torvalds 2005-04-16 398 unsigned int working = 0; 026d186e4592c1 Prike.Liang 2021-02-26 399 u32 latency2, latency3; ^^^^^^^^^^^^^^^^^^^^^^ 6eb0a0fd059598 Venkatesh Pallipadi 2006-01-11 400 169a0abbe32813 Thomas Gleixner 2007-02-16 401 pr->power.timer_broadcast_on_state = INT_MAX; 6eb0a0fd059598 Venkatesh Pallipadi 2006-01-11 402 a0bf284bfedd6d Len Brown 2009-05-15 403 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 404 struct acpi_processor_cx *cx = &pr->power.states[i]; ^1da177e4c3f41 Linus Torvalds 2005-04-16 405 ^1da177e4c3f41 Linus Torvalds 2005-04-16 406 switch (cx->type) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 407 case ACPI_STATE_C1: ^1da177e4c3f41 Linus Torvalds 2005-04-16 408 cx->valid = 1; ^1da177e4c3f41 Linus Torvalds 2005-04-16 409 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 410 ^1da177e4c3f41 Linus Torvalds 2005-04-16 411 case ACPI_STATE_C2: d22edd293ff3f1 Len Brown 2010-01-19 412 if (!cx->address) d22edd293ff3f1 Len Brown 2010-01-19 413 break; d22edd293ff3f1 Len Brown 2010-01-19 414 cx->valid = 1; 026d186e4592c1 Prike.Liang 2021-02-26 415 latency2 = cx->latency; ^^^^^^^^^^^^^^^^^^^^^^ ^1da177e4c3f41 Linus Torvalds 2005-04-16 416 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 417 ^1da177e4c3f41 Linus Torvalds 2005-04-16 418 case ACPI_STATE_C3: 026d186e4592c1 Prike.Liang 2021-02-26 419 latency3 = cx->latency; ^^^^^^^^^^^^^^^^^^^^^^^ ^1da177e4c3f41 Linus Torvalds 2005-04-16 420 acpi_processor_power_verify_c3(pr, cx); ^1da177e4c3f41 Linus Torvalds 2005-04-16 421 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 422 } 7e275cc4e8e20f Len Brown 2009-05-15 423 if (!cx->valid) 7e275cc4e8e20f Len Brown 2009-05-15 424 continue; ^1da177e4c3f41 Linus Torvalds 2005-04-16 425 7e275cc4e8e20f Len Brown 2009-05-15 426 lapic_timer_check_state(i, pr, cx); 7e275cc4e8e20f Len Brown 2009-05-15 427 tsc_check_state(cx->type); ^1da177e4c3f41 Linus Torvalds 2005-04-16 428 working++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 429 } bd6633476922b7 Andi Kleen 2006-03-25 430 026d186e4592c1 Prike.Liang 2021-02-26 431 /* Some AMD BIOSes mistakenly have higher C2 latencies than C3 latencies. 026d186e4592c1 Prike.Liang 2021-02-26 432 * In order to properly support S0ix, the platform needs to not skip C states. 026d186e4592c1 Prike.Liang 2021-02-26 433 * Correct the latencies here. 026d186e4592c1 Prike.Liang 2021-02-26 434 */ 026d186e4592c1 Prike.Liang 2021-02-26 @435 if (acpi_processor_vendor_amd() && (latency2 >= latency3)) { Probably if you know a lot about AMD and ACPI specs then you can determine that these are initialized, but static checkers only see the code. 026d186e4592c1 Prike.Liang 2021-02-26 436 pr->power.states[2].latency = 18; 026d186e4592c1 Prike.Liang 2021-02-26 437 pr->power.states[3].latency = 350; 026d186e4592c1 Prike.Liang 2021-02-26 438 } 026d186e4592c1 Prike.Liang 2021-02-26 439 918aae42aa9b61 Hidetoshi Seto 2009-12-14 440 lapic_timer_propagate_broadcast(pr); ^1da177e4c3f41 Linus Torvalds 2005-04-16 441 ^1da177e4c3f41 Linus Torvalds 2005-04-16 442 return (working); ^1da177e4c3f41 Linus Torvalds 2005-04-16 443 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org