[PATCH drm-misc-next 2/3] drm/gpuva_mgr: generalize dma_resv/extobj handling and GEM validation

[kernel test robot]

Hi Danilo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 25205087df1ffe06ccea9302944ed1f77dc68c6f]

url:    https://github.com/intel-lab-lkp/linux/commits/Danilo-Krummrich/drm-drm_exec-build-always-builtin/20230821-123143
base:   25205087df1ffe06ccea9302944ed1f77dc68c6f
patch link:    https://lore.kernel.org/r/20230820215320.4187-3-dakr%40redhat.com
patch subject: [PATCH drm-misc-next 2/3] drm/gpuva_mgr: generalize dma_resv/extobj handling and GEM validation
config: arm-randconfig-r014-20230822 (https://download.01.org/0day-ci/archive/20230822/202308221050.kTj8uFMA-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230822/202308221050.kTj8uFMA-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308221050.kTj8uFMA-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/drm_gpuva_mgr.c:750:1: warning: no previous prototype for 'drm_gpuva_manager_prepare_objects' [-Wmissing-prototypes]
     750 | drm_gpuva_manager_prepare_objects(struct drm_gpuva_manager *mgr,
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/drm_gpuva_mgr.c: In function '__drm_gpuva_sm_map':
   drivers/gpu/drm/drm_gpuva_mgr.c:1744:39: warning: variable 'prev' set but not used [-Wunused-but-set-variable]
    1744 |         struct drm_gpuva *va, *next, *prev = NULL;
         |                                       ^~~~
--
>> drivers/gpu/drm/drm_gpuva_mgr.c:1091: warning: Function parameter or member '__vm_bo' not described in 'drm_gpuva_gem_obtain_prealloc'


vim +/drm_gpuva_manager_prepare_objects +750 drivers/gpu/drm/drm_gpuva_mgr.c

   734	
   735	/**
   736	 * drm_gpuva_manager_prepare_objects() - prepare all assoiciated BOs
   737	 * @mgr: the &drm_gpuva_manager
   738	 * @num_fences: the amount of &dma_fences to reserve
   739	 *
   740	 * Calls drm_exec_prepare_obj() for all &drm_gem_objects the given
   741	 * &drm_gpuva_manager contains mappings of.
   742	 *
   743	 * Drivers can obtain the corresponding &drm_exec instance through
   744	 * DRM_GPUVA_EXEC(). It is the drivers responsibility to call drm_exec_init()
   745	 * and drm_exec_fini() accordingly.
   746	 *
   747	 * Returns: 0 on success, negative error code on failure.
   748	 */
   749	int
 > 750	drm_gpuva_manager_prepare_objects(struct drm_gpuva_manager *mgr,
   751					  unsigned int num_fences)
   752	{
   753		struct drm_exec *exec = DRM_GPUVA_EXEC(mgr);
   754		MA_STATE(mas, &mgr->mt_ext, 0, 0);
   755		union {
   756			void *ptr;
   757			uintptr_t cnt;
   758		} ref;
   759		int ret;
   760	
   761		ret = drm_exec_prepare_obj(exec, &mgr->d_obj, num_fences);
   762		if (ret)
   763			goto out;
   764	
   765		rcu_read_lock();
   766		mas_for_each(&mas, ref.ptr, ULONG_MAX) {
   767			struct drm_gem_object *obj;
   768	
   769			mas_pause(&mas);
   770			rcu_read_unlock();
   771	
   772			obj = (struct drm_gem_object *)(uintptr_t)mas.index;
   773			ret = drm_exec_prepare_obj(exec, obj, num_fences);
   774			if (ret)
   775				goto out;
   776	
   777			rcu_read_lock();
   778		}
   779		rcu_read_unlock();
   780	
   781	out:
   782		return ret;
   783	}
   784	EXPORT_SYMBOL_GPL(drm_gpuva_manager_prepare_objects);
   785	

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