[chrome-os:chromeos-4.19 9/14] drivers/gpu/drm/evdi/evdi_drv.c:74:6: warning: no previous prototype for function 'evdi_platform_device_is_free'

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

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tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.19
head:   0e5434c74b34490991f87d8c8b266e3b6b6be895
commit: 789da1dcaf055e595a9ffdc02e7b575b62a53b24 [9/14] CHROMIUM: drm/evdi: Use free platform device again after its parent was removed
config: arm64-randconfig-r012-20210220 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-4.19
        git checkout 789da1dcaf055e595a9ffdc02e7b575b62a53b24
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/evdi/evdi_drv.c:74:6: warning: no previous prototype for function 'evdi_platform_device_is_free' [-Wmissing-prototypes]
   bool evdi_platform_device_is_free(struct platform_device *pdev)
        ^
   drivers/gpu/drm/evdi/evdi_drv.c:74:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool evdi_platform_device_is_free(struct platform_device *pdev)
   ^
   static 
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for DEVFREQ_THERMAL
   Depends on THERMAL && PM_DEVFREQ && PM_OPP
   Selected by
   - DRM_POWERVR_ROGUE_1_10 && ARM64 && HAS_IOMEM && DRM && SYNC_FILE


vim +/evdi_platform_device_is_free +74 drivers/gpu/drm/evdi/evdi_drv.c

    73	
  > 74	bool evdi_platform_device_is_free(struct platform_device *pdev)
    75	{
    76		struct drm_device *drm_dev =
    77			(struct drm_device *)platform_get_drvdata(pdev);
    78		struct evdi_device *evdi = drm_dev->dev_private;
    79	
    80		if (evdi && !evdi_painter_is_connected(evdi))
    81			return true;
    82		return false;
    83	}
    84	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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