tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git bleeding-edge head: 5bff8c754ebfc08b9cead967f38ebc0152d2076f commit: efe9711214e6138a5a2a46ca4068bfce50c03444 [83/91] cpuidle: change enter_s2idle() prototype config: ia64-randconfig-r024-20200729 (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 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 git checkout efe9711214e6138a5a2a46ca4068bfce50c03444 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): drivers/acpi/processor_idle.c: In function 'acpi_idle_enter': drivers/acpi/processor_idle.c:649:25: warning: suggest braces around empty body in an 'if' statement [-Wempty-body] 649 | ACPI_FLUSH_CPU_CACHE(); | ^ drivers/acpi/processor_idle.c: In function 'acpi_idle_enter_s2idle': >> drivers/acpi/processor_idle.c:667:4: warning: 'return' with no value, in function returning non-void [-Wreturn-type] 667 | return; | ^~~~~~ drivers/acpi/processor_idle.c:658:12: note: declared here 658 | static int acpi_idle_enter_s2idle(struct cpuidle_device *dev, | ^~~~~~~~~~~~~~~~~~~~~~ drivers/acpi/processor_idle.c:671:4: warning: 'return' with no value, in function returning non-void [-Wreturn-type] 671 | return; | ^~~~~~ drivers/acpi/processor_idle.c:658:12: note: declared here 658 | static int acpi_idle_enter_s2idle(struct cpuidle_device *dev, | ^~~~~~~~~~~~~~~~~~~~~~ drivers/acpi/processor_idle.c: At top level: drivers/acpi/processor_idle.c:1085:12: warning: no previous prototype for 'acpi_processor_ffh_lpi_probe' [-Wmissing-prototypes] 1085 | int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/acpi/processor_idle.c:1090:12: warning: no previous prototype for 'acpi_processor_ffh_lpi_enter' [-Wmissing-prototypes] 1090 | int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/return +667 drivers/acpi/processor_idle.c 4f86d3a8e297205 Len Brown 2007-10-03 657 efe9711214e6138 Neal Liu 2020-07-27 658 static int acpi_idle_enter_s2idle(struct cpuidle_device *dev, 5f5081852038d9a Rafael J. Wysocki 2015-02-11 659 struct cpuidle_driver *drv, int index) 5f5081852038d9a Rafael J. Wysocki 2015-02-11 660 { 5f5081852038d9a Rafael J. Wysocki 2015-02-11 661 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 5f5081852038d9a Rafael J. Wysocki 2015-02-11 662 5f5081852038d9a Rafael J. Wysocki 2015-02-11 663 if (cx->type == ACPI_STATE_C3) { 5f5081852038d9a Rafael J. Wysocki 2015-02-11 664 struct acpi_processor *pr = __this_cpu_read(processors); 5f5081852038d9a Rafael J. Wysocki 2015-02-11 665 5f5081852038d9a Rafael J. Wysocki 2015-02-11 666 if (unlikely(!pr)) 5f5081852038d9a Rafael J. Wysocki 2015-02-11 @667 return; 5f5081852038d9a Rafael J. Wysocki 2015-02-11 668 5f5081852038d9a Rafael J. Wysocki 2015-02-11 669 if (pr->flags.bm_check) { 5f5081852038d9a Rafael J. Wysocki 2015-02-11 670 acpi_idle_enter_bm(pr, cx, false); 5f5081852038d9a Rafael J. Wysocki 2015-02-11 671 return; 5f5081852038d9a Rafael J. Wysocki 2015-02-11 672 } else { 5f5081852038d9a Rafael J. Wysocki 2015-02-11 673 ACPI_FLUSH_CPU_CACHE(); 5f5081852038d9a Rafael J. Wysocki 2015-02-11 674 } 5f5081852038d9a Rafael J. Wysocki 2015-02-11 675 } 5f5081852038d9a Rafael J. Wysocki 2015-02-11 676 acpi_idle_do_entry(cx); efe9711214e6138 Neal Liu 2020-07-27 677 efe9711214e6138 Neal Liu 2020-07-27 678 return 0; 5f5081852038d9a Rafael J. Wysocki 2015-02-11 679 } 5f5081852038d9a Rafael J. Wysocki 2015-02-11 680 :::::: The code at line 667 was first introduced by commit :::::: 5f5081852038d9a7b309190730bfb724b413235e ACPI / idle: Implement ->enter_freeze callback routine :::::: TO: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> :::::: CC: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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