Hi Jon, [auto build test WARNING on next-20160215]
url: https://github.com/0day-ci/linux/commits/Jon-Hunter/PM-OPP-Fix-NULL-pointer-dereference-crash-when-setting-the-OPP/20160215-220238 config: x86_64-randconfig-s0-02160737 (attached as .config) 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:603:38: warning: 'ou_volt_max' may be used >> uninitialized in this function [-Wmaybe-uninitialized] unsigned long ou_volt, ou_volt_min, ou_volt_max; ^ >> drivers/base/power/opp/core.c:603:25: warning: 'ou_volt_min' may be used >> uninitialized in this function [-Wmaybe-uninitialized] unsigned long ou_volt, ou_volt_min, ou_volt_max; ^ >> drivers/base/power/opp/core.c:603:16: warning: 'ou_volt' may be used >> uninitialized in this function [-Wmaybe-uninitialized] unsigned long ou_volt, ou_volt_min, ou_volt_max; ^ vim +/ou_volt_max +603 drivers/base/power/opp/core.c 6a0712f6 Viresh Kumar 2016-02-09 587 * @dev: device for which we do this operation 6a0712f6 Viresh Kumar 2016-02-09 588 * @target_freq: frequency to achieve 6a0712f6 Viresh Kumar 2016-02-09 589 * 6a0712f6 Viresh Kumar 2016-02-09 590 * This configures the power-supplies and clock source to the levels specified 6a0712f6 Viresh Kumar 2016-02-09 591 * by the OPP corresponding to the target_freq. 6a0712f6 Viresh Kumar 2016-02-09 592 * 6a0712f6 Viresh Kumar 2016-02-09 593 * Locking: This function takes rcu_read_lock(). 6a0712f6 Viresh Kumar 2016-02-09 594 */ 6a0712f6 Viresh Kumar 2016-02-09 595 int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) 6a0712f6 Viresh Kumar 2016-02-09 596 { 6a0712f6 Viresh Kumar 2016-02-09 597 struct device_opp *dev_opp; 6a0712f6 Viresh Kumar 2016-02-09 598 struct dev_pm_opp *old_opp, *opp; 6a0712f6 Viresh Kumar 2016-02-09 599 struct regulator *reg; 6a0712f6 Viresh Kumar 2016-02-09 600 struct clk *clk; 6a0712f6 Viresh Kumar 2016-02-09 601 unsigned long freq, old_freq; 6a0712f6 Viresh Kumar 2016-02-09 602 unsigned long u_volt, u_volt_min, u_volt_max; 6a0712f6 Viresh Kumar 2016-02-09 @603 unsigned long ou_volt, ou_volt_min, ou_volt_max; 6a0712f6 Viresh Kumar 2016-02-09 604 int ret; 6a0712f6 Viresh Kumar 2016-02-09 605 6a0712f6 Viresh Kumar 2016-02-09 606 if (unlikely(!target_freq)) { 6a0712f6 Viresh Kumar 2016-02-09 607 dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, 6a0712f6 Viresh Kumar 2016-02-09 608 target_freq); 6a0712f6 Viresh Kumar 2016-02-09 609 return -EINVAL; 6a0712f6 Viresh Kumar 2016-02-09 610 } 6a0712f6 Viresh Kumar 2016-02-09 611 :::::: The code at line 603 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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