Hi Jesper,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Jesper-Dangaard-Brouer/xdp-introduce-bulking-for-ndo_xdp_xmit-API/20180510-134105
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-a1-05100951 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net/core/xdp.o: In function `__xdp_return':
>> net/core/xdp.c:323: undefined reference to `__page_pool_put_page'

vim +323 net/core/xdp.c

   310	
   311	static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct)
   312	{
   313		struct xdp_mem_allocator *xa;
   314		struct page *page;
   315	
   316		switch (mem->type) {
   317		case MEM_TYPE_PAGE_POOL:
   318			rcu_read_lock();
   319			/* mem->id is valid, checked in xdp_rxq_info_reg_mem_model() */
   320			xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
   321			page = virt_to_head_page(data);
   322			if (xa)
 > 323				__page_pool_put_page(xa->page_pool, page, napi_direct);
   324			else
   325				put_page(page);
   326			rcu_read_unlock();
   327			break;
   328		case MEM_TYPE_PAGE_SHARED:
   329			page_frag_free(data);
   330			break;
   331		case MEM_TYPE_PAGE_ORDER0:
   332			page = virt_to_page(data); /* Assumes order0 page*/
   333			put_page(page);
   334			break;
   335		default:
   336			/* Not possible, checked in xdp_rxq_info_reg_mem_model() */
   337			break;
   338		}
   339	}
   340	

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