tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git pm-sleep-core head: a52086e57479bf4eb7e328aefc491dcb0c2da475 commit: bc95fd57b878a950c92e57ce8e2bd9d33a40d0cf [2/3] PM: sleep: core: Fold functions into their callers config: powerpc-defconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout bc95fd57b878a950c92e57ce8e2bd9d33a40d0cf # save the attached .config to linux build tree GCC_VERSION=9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/base/power/main.c:568:21: warning: 'suspend_event' defined but not used [-Wunused-function] 568 | static pm_message_t suspend_event(pm_message_t resume_msg) | ^~~~~~~~~~~~~ drivers/base/power/main.c: In function 'device_resume_early': drivers/base/power/main.c:824:10: warning: 'info' may be used uninitialized in this function [-Wmaybe-uninitialized] 824 | error = dpm_run_callback(callback, dev, state, info); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/base/power/main.c:824:10: warning: 'callback' may be used uninitialized in this function [-Wmaybe-uninitialized] drivers/base/power/main.c: In function 'device_resume_noirq': drivers/base/power/main.c:664:10: warning: 'info' may be used uninitialized in this function [-Wmaybe-uninitialized] 664 | error = dpm_run_callback(callback, dev, state, info); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/base/power/main.c: In function '__device_suspend_noirq': drivers/base/power/main.c:1248:10: warning: 'info' may be used uninitialized in this function [-Wmaybe-uninitialized] 1248 | error = dpm_run_callback(callback, dev, state, info); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/base/power/main.c: In function '__device_suspend_late': drivers/base/power/main.c:1449:10: warning: 'info' may be used uninitialized in this function [-Wmaybe-uninitialized] 1449 | error = dpm_run_callback(callback, dev, state, info); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/callback +824 drivers/base/power/main.c cf579dfb82550e Rafael J. Wysocki 2012-01-29 780 cf579dfb82550e Rafael J. Wysocki 2012-01-29 781 /** cf579dfb82550e Rafael J. Wysocki 2012-01-29 782 * device_resume_early - Execute an "early resume" callback for given device. cf579dfb82550e Rafael J. Wysocki 2012-01-29 783 * @dev: Device to handle. cf579dfb82550e Rafael J. Wysocki 2012-01-29 784 * @state: PM transition of the system being carried out. 58c256a3a37ea7 Randy Dunlap 2014-07-27 785 * @async: If true, the device is being resumed asynchronously. cf579dfb82550e Rafael J. Wysocki 2012-01-29 786 * cf579dfb82550e Rafael J. Wysocki 2012-01-29 787 * Runtime PM is disabled for @dev while this function is being executed. cf579dfb82550e Rafael J. Wysocki 2012-01-29 788 */ 9e5e7910df824b Liu, Chuansheng 2014-02-18 789 static int device_resume_early(struct device *dev, pm_message_t state, bool async) cf579dfb82550e Rafael J. Wysocki 2012-01-29 790 { 4fa3061a6856cc Rafael J. Wysocki 2017-12-10 791 pm_callback_t callback; 4fa3061a6856cc Rafael J. Wysocki 2017-12-10 792 const char *info; cf579dfb82550e Rafael J. Wysocki 2012-01-29 793 int error = 0; cf579dfb82550e Rafael J. Wysocki 2012-01-29 794 cf579dfb82550e Rafael J. Wysocki 2012-01-29 795 TRACE_DEVICE(dev); cf579dfb82550e Rafael J. Wysocki 2012-01-29 796 TRACE_RESUME(0); cf579dfb82550e Rafael J. Wysocki 2012-01-29 797 aae4518b3124b2 Rafael J. Wysocki 2014-05-16 798 if (dev->power.syscore || dev->power.direct_complete) dbf374142dd7a3 Rafael J. Wysocki 2012-08-06 799 goto Out; dbf374142dd7a3 Rafael J. Wysocki 2012-08-06 800 3d2699bc179a10 Liu, Chuansheng 2014-02-18 801 if (!dev->power.is_late_suspended) 3d2699bc179a10 Liu, Chuansheng 2014-02-18 802 goto Out; 3d2699bc179a10 Liu, Chuansheng 2014-02-18 803 0552e05fdfea19 Rafael J. Wysocki 2020-01-23 804 if (!dpm_wait_for_superior(dev, async)) 0552e05fdfea19 Rafael J. Wysocki 2020-01-23 805 goto Out; 9e5e7910df824b Liu, Chuansheng 2014-02-18 806 bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 807 if (dev->pm_domain) { bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 808 info = "early power domain "; bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 809 callback = pm_late_early_op(&dev->pm_domain->ops, state); bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 810 } else if (dev->type && dev->type->pm) { bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 811 info = "early type "; bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 812 callback = pm_late_early_op(dev->type->pm, state); bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 813 } else if (dev->class && dev->class->pm) { bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 814 info = "early class "; bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 815 callback = pm_late_early_op(dev->class->pm, state); bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 816 } else if (dev->bus && dev->bus->pm) { bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 817 info = "early bus "; bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 818 callback = pm_late_early_op(dev->bus->pm, state); bc95fd57b878a9 Rafael J. Wysocki 2020-04-04 819 } else if (dev->driver && dev->driver->pm) { cf579dfb82550e Rafael J. Wysocki 2012-01-29 820 info = "early driver "; cf579dfb82550e Rafael J. Wysocki 2012-01-29 821 callback = pm_late_early_op(dev->driver->pm, state); cf579dfb82550e Rafael J. Wysocki 2012-01-29 822 } cf579dfb82550e Rafael J. Wysocki 2012-01-29 823 cf579dfb82550e Rafael J. Wysocki 2012-01-29 @824 error = dpm_run_callback(callback, dev, state, info); 3d2699bc179a10 Liu, Chuansheng 2014-02-18 825 dev->power.is_late_suspended = false; cf579dfb82550e Rafael J. Wysocki 2012-01-29 826 dbf374142dd7a3 Rafael J. Wysocki 2012-08-06 827 Out: cf579dfb82550e Rafael J. Wysocki 2012-01-29 828 TRACE_RESUME(error); 9f6d8f6ab26b42 Rafael J. Wysocki 2012-12-22 829 9f6d8f6ab26b42 Rafael J. Wysocki 2012-12-22 830 pm_runtime_enable(dev); 9e5e7910df824b Liu, Chuansheng 2014-02-18 831 complete_all(&dev->power.completion); cf579dfb82550e Rafael J. Wysocki 2012-01-29 832 return error; cf579dfb82550e Rafael J. Wysocki 2012-01-29 833 } cf579dfb82550e Rafael J. Wysocki 2012-01-29 834 :::::: The code at line 824 was first introduced by commit :::::: cf579dfb82550e34de7ccf3ef090d8b834ccd3a9 PM / Sleep: Introduce "late suspend" and "early resume" of devices :::::: TO: Rafael J. Wysocki <rjw@xxxxxxx> :::::: CC: Rafael J. Wysocki <rjw@xxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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