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SubjectRe: [PATCH v4 1/5] ACPI / processor_idle: introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE
Hi,

[auto build test ERROR on pm/linux-next]
[also build test ERROR on v4.6-rc4 next-20160419]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url: https://github.com/0day-ci/linux/commits/Sudeep-Holla/ACPI-processor_idle-Add-ACPI-v6-0-LPI-support/20160419-203500
base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: i386-randconfig-x000-201616 (attached as .config)
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

Note: the linux-review/Sudeep-Holla/ACPI-processor_idle-Add-ACPI-v6-0-LPI-support/20160419-203500 HEAD c51fc2a756d7b0dce908a4ca043d1d458c400af5 builds fine.
It only hurts bisectibility.

All error/warnings (new ones prefixed by >>):

drivers/acpi/processor_idle.c: In function 'acpi_processor_cstate_first_run_checks':
>> drivers/acpi/processor_idle.c:943:3: error: 'status' undeclared (first use in this function)
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
^
drivers/acpi/processor_idle.c:943:3: note: each undeclared identifier is reported only once for each function it appears in
drivers/acpi/processor_idle.c: In function 'acpi_processor_power_init':
>> drivers/acpi/processor_idle.c:1062:14: warning: unused variable 'status' [-Wunused-variable]
acpi_status status;
^

vim +/status +943 drivers/acpi/processor_idle.c

937 if (max_cstate < ACPI_C_STATES_MAX)
938 pr_notice("ACPI: processor limited to max C-state %d\n",
939 max_cstate);
940 first_run++;
941
942 if (acpi_gbl_FADT.cst_control && !nocst) {
> 943 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
944 acpi_gbl_FADT.cst_control, 8);
945 if (ACPI_FAILURE(status))
946 ACPI_EXCEPTION((AE_INFO, status,
947 "Notifying BIOS of _CST ability failed"));
948 }
949 }
950 #else
951
952 static inline int disabled_by_idle_boot_param(void) { return 0; }
953 static inline void acpi_processor_cstate_first_run_checks(void) { }
954 static int acpi_processor_get_power_info(struct acpi_processor *pr)
955 {
956 return -ENODEV;
957 }
958
959 static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
960 struct cpuidle_device *dev)
961 {
962 return -EINVAL;
963 }
964
965 static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
966 {
967 return -EINVAL;
968 }
969
970 #endif
971
972 int acpi_processor_hotplug(struct acpi_processor *pr)
973 {
974 int ret = 0;
975 struct cpuidle_device *dev;
976
977 if (disabled_by_idle_boot_param())
978 return 0;
979
980 if (nocst)
981 return -ENODEV;
982
983 if (!pr->flags.power_setup_done)
984 return -ENODEV;
985
986 dev = per_cpu(acpi_cpuidle_device, pr->id);
987 cpuidle_pause_and_lock();
988 cpuidle_disable_device(dev);
989 acpi_processor_get_power_info(pr);
990 if (pr->flags.power) {
991 acpi_processor_setup_cpuidle_cx(pr, dev);
992 ret = cpuidle_enable_device(dev);
993 }
994 cpuidle_resume_and_unlock();
995
996 return ret;
997 }
998
999 int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1000 {
1001 int cpu;
1002 struct acpi_processor *_pr;
1003 struct cpuidle_device *dev;
1004
1005 if (disabled_by_idle_boot_param())
1006 return 0;
1007
1008 if (nocst)
1009 return -ENODEV;
1010
1011 if (!pr->flags.power_setup_done)
1012 return -ENODEV;
1013
1014 /*
1015 * FIXME: Design the ACPI notification to make it once per
1016 * system instead of once per-cpu. This condition is a hack
1017 * to make the code that updates C-States be called once.
1018 */
1019
1020 if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) {
1021
1022 /* Protect against cpu-hotplug */
1023 get_online_cpus();
1024 cpuidle_pause_and_lock();
1025
1026 /* Disable all cpuidle devices */
1027 for_each_online_cpu(cpu) {
1028 _pr = per_cpu(processors, cpu);
1029 if (!_pr || !_pr->flags.power_setup_done)
1030 continue;
1031 dev = per_cpu(acpi_cpuidle_device, cpu);
1032 cpuidle_disable_device(dev);
1033 }
1034
1035 /* Populate Updated C-state information */
1036 acpi_processor_get_power_info(pr);
1037 acpi_processor_setup_cpuidle_states(pr);
1038
1039 /* Enable all cpuidle devices */
1040 for_each_online_cpu(cpu) {
1041 _pr = per_cpu(processors, cpu);
1042 if (!_pr || !_pr->flags.power_setup_done)
1043 continue;
1044 acpi_processor_get_power_info(_pr);
1045 if (_pr->flags.power) {
1046 dev = per_cpu(acpi_cpuidle_device, cpu);
1047 acpi_processor_setup_cpuidle_cx(_pr, dev);
1048 cpuidle_enable_device(dev);
1049 }
1050 }
1051 cpuidle_resume_and_unlock();
1052 put_online_cpus();
1053 }
1054
1055 return 0;
1056 }
1057
1058 static int acpi_processor_registered;
1059
1060 int acpi_processor_power_init(struct acpi_processor *pr)
1061 {
> 1062 acpi_status status;
1063 int retval;
1064 struct cpuidle_device *dev;
1065

---
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