Hi, [auto build test WARNING on pm/linux-next] [also build test WARNING on v4.7-rc7 next-20160722] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Jisheng-Zhang/PM-OPP-optimize-dev_pm_opp_set_rate-a-bit/20160722-205339 base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-allmodconfig (attached as .config) compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 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/opp/core.c: In function 'dev_pm_opp_set_rate': >> drivers/base/power/opp/core.c:666:3: warning: 'ou_volt_max' may be used >> uninitialized in this function [-Wmaybe-uninitialized] _set_opp_voltage(dev, reg, ou_volt, ou_volt_min, ou_volt_max); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/base/power/opp/core.c:666:3: warning: 'ou_volt_min' may be used >> uninitialized in this function [-Wmaybe-uninitialized] >> drivers/base/power/opp/core.c:666:3: warning: 'ou_volt' may be used >> uninitialized in this function [-Wmaybe-uninitialized] vim +/ou_volt_max +666 drivers/base/power/opp/core.c 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 650 if (freq < old_freq) { 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 651 ret = _set_opp_voltage(dev, reg, u_volt, u_volt_min, 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 652 u_volt_max); 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 653 if (ret) 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 654 goto restore_freq; 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 655 } 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 656 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 657 return 0; 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 658 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 659 restore_freq: 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 660 if (clk_set_rate(clk, old_freq)) 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 661 dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 662 __func__, old_freq); 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 663 restore_voltage: 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 664 /* This shouldn't harm even if the voltages weren't updated earlier */ 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 665 if (!IS_ERR(old_opp)) 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 @666 _set_opp_voltage(dev, reg, ou_volt, ou_volt_min, ou_volt_max); 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 667 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 668 return ret; 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 669 } 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 670 EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); 6a0712f6 drivers/base/power/opp/core.c Viresh Kumar 2016-02-09 671 2c2709dc drivers/base/power/opp/core.c Viresh Kumar 2016-02-16 672 /* OPP-dev Helpers */ 2c2709dc drivers/base/power/opp/core.c Viresh Kumar 2016-02-16 673 static void _kfree_opp_dev_rcu(struct rcu_head *head) 06441658 drivers/base/power/opp.c Viresh Kumar 2015-07-29 674 { :::::: The code at line 666 was first introduced by commit :::::: 6a0712f6f199e737aa5913d28ec4bd3a25de9660 PM / OPP: Add dev_pm_opp_set_rate() :::::: TO: Viresh Kumar <viresh.ku...@linaro.org> :::::: CC: Rafael J. Wysocki <rafael.j.wyso...@intel.com> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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