Re: [PATCH 3/4] PM: EM: Add em_dev_update_chip_binning()

[kernel test robot <lkp@intel.com>]

Hi Lukasz,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on linus/master next-20240315]
[cannot apply to krzk/for-next clk/clk-next soc/for-next rafael-pm/acpi-bus rafael-pm/devprop v6.8]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lukasz-Luba/OPP-OF-Export-dev_opp_pm_calc_power-for-usage-from-EM/20240314-220719
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20240314140421.3563571-4-lukasz.luba%40arm.com
patch subject: [PATCH 3/4] PM: EM: Add em_dev_update_chip_binning()
config: i386-randconfig-141-20240315 (https://download.01.org/0day-ci/archive/20240316/202403160033.Kh6R75dh-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240316/202403160033.Kh6R75dh-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403160033.Kh6R75dh-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/power/energy_model.c:824:52: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
     824 |                 dev_warn(dev, "Couldn't find Energy Model %d\n", ret);
         |                                                                  ^~~
   include/linux/dev_printk.h:146:70: note: expanded from macro 'dev_warn'
     146 |         dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                                             ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                                     ^~~~~~~~~~~
   kernel/power/energy_model.c:817:12: note: initialize the variable 'ret' to silence this warning
     817 |         int i, ret;
         |                   ^
         |                    = 0
   1 warning generated.


vim +/ret +824 kernel/power/energy_model.c

   800	
   801	/**
   802	 * em_dev_update_chip_binning() - Update Energy Model with new values after
   803	 *			the new voltage information is present in the OPPs.
   804	 * @dev		: Device for which the Energy Model has to be updated.
   805	 *
   806	 * This function allows to update easily the EM with new values available in
   807	 * the OPP framework and DT. It can be used after the chip has been properly
   808	 * verified by device drivers and the voltages adjusted for the 'chip binning'.
   809	 * It uses the "dynamic-power-coefficient" DT property to calculate the power
   810	 * values for EM. For power calculation it uses the new adjusted voltage
   811	 * values known for OPPs, which might be changed after boot.
   812	 */
   813	int em_dev_update_chip_binning(struct device *dev)
   814	{
   815		struct em_perf_table __rcu *em_table;
   816		struct em_perf_domain *pd;
   817		int i, ret;
   818	
   819		if (IS_ERR_OR_NULL(dev))
   820			return -EINVAL;
   821	
   822		pd = em_pd_get(dev);
   823		if (!pd) {
 > 824			dev_warn(dev, "Couldn't find Energy Model %d\n", ret);

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