[PATCH 3/5] ttm: add initial memcg integration. (v2)

[kernel test robot]

Hi Dave,

kernel test robot noticed the following build errors:

[auto build test ERROR on tj-cgroup/for-next]
[also build test ERROR on akpm-mm/mm-everything linus/master v6.15-rc4]
[cannot apply to drm-misc/drm-misc-next drm-tip/drm-tip next-20250502]
[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/Dave-Airlie/memcg-add-hooks-for-gpu-memcg-charging-uncharging/20250502-123650
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next
patch link:    https://lore.kernel.org/r/20250502034046.1625896-4-airlied%40gmail.com
patch subject: [PATCH 3/5] ttm: add initial memcg integration. (v2)
config: s390-randconfig-001-20250503 (https://download.01.org/0day-ci/archive/20250503/202505030927.6cZ0SdOU-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250503/202505030927.6cZ0SdOU-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/202505030927.6cZ0SdOU-lkp@intel.com/

All errors (new ones prefixed by >>):

   s390-linux-ld: drivers/gpu/drm/ttm/ttm_resource.o: in function `ttm_resource_free':
>> drivers/gpu/drm/ttm/ttm_resource.c:443: undefined reference to `mem_cgroup_uncharge_gpu'
   s390-linux-ld: drivers/gpu/drm/ttm/ttm_resource.o: in function `ttm_resource_alloc':
   drivers/gpu/drm/ttm/ttm_resource.c:408: undefined reference to `mem_cgroup_uncharge_gpu'
>> s390-linux-ld: drivers/gpu/drm/ttm/ttm_resource.c:400: undefined reference to `mem_cgroup_charge_gpu'


vim +443 drivers/gpu/drm/ttm/ttm_resource.c

   374	
   375	int ttm_resource_alloc(struct ttm_buffer_object *bo,
   376			       const struct ttm_place *place,
   377			       struct ttm_operation_ctx *ctx,
   378			       struct ttm_resource **res_ptr,
   379			       struct dmem_cgroup_pool_state **ret_limit_pool)
   380	{
   381		struct ttm_resource_manager *man =
   382			ttm_manager_type(bo->bdev, place->mem_type);
   383		struct dmem_cgroup_pool_state *pool = NULL;
   384		struct mem_cgroup *memcg = NULL;
   385		int ret;
   386	
   387		if (man->cg) {
   388			ret = dmem_cgroup_try_charge(man->cg, bo->base.size, &pool, ret_limit_pool);
   389			if (ret)
   390				return ret;
   391		}
   392	
   393		if ((place->mem_type == TTM_PL_SYSTEM || place->mem_type == TTM_PL_TT) &&
   394		    ctx->account_op && bo->memcg) {
   395			memcg = bo->memcg;
   396			gfp_t gfp_flags = GFP_USER;
   397			if (ctx->gfp_retry_mayfail)
   398				gfp_flags |= __GFP_RETRY_MAYFAIL;
   399	
 > 400			if (!mem_cgroup_charge_gpu(memcg, bo->base.size >> PAGE_SHIFT, gfp_flags))
   401				return -ENOMEM;
   402		}
   403		ret = man->func->alloc(man, bo, place, res_ptr);
   404		if (ret) {
   405			if (pool)
   406				dmem_cgroup_uncharge(pool, bo->base.size);
   407			if (memcg)
   408				mem_cgroup_uncharge_gpu(memcg, bo->base.size >> PAGE_SHIFT);
   409			return ret;
   410		}
   411	
   412		(*res_ptr)->memcg = memcg;
   413		(*res_ptr)->css = pool;
   414	
   415		spin_lock(&bo->bdev->lru_lock);
   416		ttm_resource_add_bulk_move(*res_ptr, bo);
   417		spin_unlock(&bo->bdev->lru_lock);
   418		return 0;
   419	}
   420	EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
   421	
   422	void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
   423	{
   424		struct ttm_resource_manager *man;
   425		struct dmem_cgroup_pool_state *pool;
   426		struct mem_cgroup *memcg;
   427	
   428		if (!*res)
   429			return;
   430	
   431		spin_lock(&bo->bdev->lru_lock);
   432		ttm_resource_del_bulk_move(*res, bo);
   433		spin_unlock(&bo->bdev->lru_lock);
   434	
   435		pool = (*res)->css;
   436		memcg = (*res)->memcg;
   437		man = ttm_manager_type(bo->bdev, (*res)->mem_type);
   438		man->func->free(man, *res);
   439		*res = NULL;
   440		if (man->cg)
   441			dmem_cgroup_uncharge(pool, bo->base.size);
   442		if (memcg)
 > 443			mem_cgroup_uncharge_gpu(memcg, bo->base.size >> PAGE_SHIFT);
   444	}
   445	EXPORT_SYMBOL(ttm_resource_free);
   446	

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