[PTACH v3] drm/ast: add dmabuf/prime buffer sharing support

[kernel test robot]

Hi oushixiong,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-intel/for-linux-next drm-tip/drm-tip linus/master v6.0-rc3 next-20220826]
[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/oushixiong/drm-ast-add-dmabuf-prime-buffer-sharing-support/20220829-084713
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220829/202208291132.RQqpjzO1-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/da31884b8b7e33af5cd8aa750dea30fde59d52aa
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review oushixiong/drm-ast-add-dmabuf-prime-buffer-sharing-support/20220829-084713
        git checkout da31884b8b7e33af5cd8aa750dea30fde59d52aa
        # 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=i386 SHELL=/bin/bash drivers/gpu/drm/ast/

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/ast/ast_drv.c:54:24: warning: no previous prototype for function 'ast_gem_prime_import' [-Wmissing-prototypes]
   struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev,
                          ^
   drivers/gpu/drm/ast/ast_drv.c:54:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev,
   ^
   static 
   1 warning generated.


vim +/ast_gem_prime_import +54 drivers/gpu/drm/ast/ast_drv.c

    53	
  > 54	struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev,
    55							struct dma_buf *dma_buf)
    56	{
    57		struct drm_gem_vram_object *gbo;
    58	
    59		gbo = drm_gem_vram_of_gem(dma_buf->priv);
    60		if (gbo->bo.base.dev == dev) {
    61			/*
    62			* Importing dmabuf exported from out own gem increases
    63			* refcount on gem itself instead of f_count of dmabuf.
    64			*/
    65			drm_gem_object_get(&gbo->bo.base);
    66			return &gbo->bo.base;
    67		}
    68	
    69		gbo = drm_gem_vram_create(dev, dma_buf->size, 0);
    70		if (IS_ERR(gbo))
    71			return NULL;
    72	
    73		get_dma_buf(dma_buf);
    74		return &gbo->bo.base;
    75	}
    76	

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