Re: [Intel-gfx] [PATCH v2] drm/i915/gt: Add sysfs RAPL PL1 interface

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

Hi Sujaritha,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]

url:    https://github.com/intel-lab-lkp/linux/commits/Sujaritha-Sundaresan/drm-i915-gt-Add-sysfs-RAPL-PL1-interface/20230131-152446
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
patch link:    https://lore.kernel.org/r/20230131062550.11901-1-sujaritha.sundaresan%40intel.com
patch subject: [Intel-gfx] [PATCH v2] drm/i915/gt: Add sysfs RAPL PL1 interface
config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20230131/202301311720.VOyrcus2-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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
        # https://github.com/intel-lab-lkp/linux/commit/562c57549ee00ea298f9023380d44526d6d68921
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sujaritha-Sundaresan/drm-i915-gt-Add-sysfs-RAPL-PL1-interface/20230131-152446
        git checkout 562c57549ee00ea298f9023380d44526d6d68921
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/i915/gt/intel_rps.c:2217:6: warning: variable 'rapl' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (IS_METEORLAKE(i915) || IS_XEHPSDV(i915))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/i915_drv.h:565:33: note: expanded from macro 'IS_METEORLAKE'
   #define IS_METEORLAKE(dev_priv) IS_PLATFORM(dev_priv, INTEL_METEORLAKE)
                                   ^
   drivers/gpu/drm/i915/gt/intel_rps.c:2220:9: note: uninitialized use occurs here
           return rapl;
                  ^~~~
   drivers/gpu/drm/i915/gt/intel_rps.c:2217:2: note: remove the 'if' if its condition is always true
           if (IS_METEORLAKE(i915) || IS_XEHPSDV(i915))
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/gt/intel_rps.c:2209:10: note: initialize the variable 'rapl' to silence this warning
           u32 rapl;
                   ^
                    = 0
   1 warning generated.


vim +2217 drivers/gpu/drm/i915/gt/intel_rps.c

  2204	
  2205	u32 intel_rps_read_rapl_pl1(struct intel_rps *rps)
  2206	{
  2207		struct drm_i915_private *i915 = rps_to_i915(rps);
  2208		u32 rapl_pl1;
  2209		u32 rapl;
  2210	
  2211		if (IS_METEORLAKE(i915))
  2212			rapl_pl1 = intel_uncore_read(rps_to_gt(rps)->uncore, MTL_RAPL_PL1_FREQ_LIMIT);
  2213		else if (IS_XEHPSDV(i915))
  2214			rapl_pl1  = intel_uncore_read(rps_to_gt(rps)->uncore, XEHPSDV_RAPL_PL1_FREQ_LIMIT);
  2215	
  2216	
> 2217		if (IS_METEORLAKE(i915) || IS_XEHPSDV(i915))
  2218			rapl = REG_FIELD_GET(RAPL_PL1_FREQ_LIMIT_MASK, rapl_pl1);
  2219	
  2220		return rapl;
  2221	}
  2222	

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