Hi Byungchul, kernel test robot noticed the following build warnings: [auto build test WARNING on c65d34296b2252897e37835d6007bbd01b255742] url: https://github.com/intel-lab-lkp/linux/commits/Byungchul-Park/netmem-introduce-struct-netmem_desc-mirroring-struct-page/20250717-150253 base: c65d34296b2252897e37835d6007bbd01b255742 patch link: https://lore.kernel.org/r/20250717070052.6358-13-byungchul%40sk.com patch subject: [Intel-wired-lan] [PATCH net-next v11 12/12] libeth: xdp: access ->pp through netmem_desc instead of page config: arm-randconfig-r072-20250717 (https://download.01.org/0day-ci/archive/20250718/202507180111.jygqJHzk-lkp@xxxxxxxxx/config) compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250718/202507180111.jygqJHzk-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202507180111.jygqJHzk-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from include/linux/container_of.h:5, from include/linux/list.h:5, from include/linux/timer.h:5, from include/linux/netdevice.h:24, from include/trace/events/xdp.h:8, from include/linux/bpf_trace.h:5, from include/net/libeth/xdp.h:7, from drivers/net/ethernet/intel/libeth/tx.c:6: include/net/libeth/xdp.h: In function 'libeth_xdp_prepare_buff': >> include/net/libeth/xdp.h:1295:23: warning: passing argument 1 of 'page_pool_page_is_pp' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] pp_page_to_nmdesc(page)->pp->p.offset, len, true); ^~~~ include/linux/build_bug.h:30:63: note: in definition of macro 'BUILD_BUG_ON_INVALID' #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) ^ include/net/netmem.h:301:2: note: in expansion of macro 'DEBUG_NET_WARN_ON_ONCE' DEBUG_NET_WARN_ON_ONCE(!page_pool_page_is_pp(p)); \ ^~~~~~~~~~~~~~~~~~~~~~ include/net/libeth/xdp.h:1295:5: note: in expansion of macro 'pp_page_to_nmdesc' pp_page_to_nmdesc(page)->pp->p.offset, len, true); ^~~~~~~~~~~~~~~~~ In file included from arch/arm/include/asm/cacheflush.h:10, from include/linux/cacheflush.h:5, from include/linux/highmem.h:8, from include/linux/bvec.h:10, from include/linux/skbuff.h:17, from include/net/net_namespace.h:43, from include/linux/netdevice.h:38, from include/trace/events/xdp.h:8, from include/linux/bpf_trace.h:5, from include/net/libeth/xdp.h:7, from drivers/net/ethernet/intel/libeth/tx.c:6: include/linux/mm.h:4176:54: note: expected 'struct page *' but argument is of type 'const struct page *' static inline bool page_pool_page_is_pp(struct page *page) ~~~~~~~~~~~~~^~~~ vim +1295 include/net/libeth/xdp.h 1263 1264 bool libeth_xdp_buff_add_frag(struct libeth_xdp_buff *xdp, 1265 const struct libeth_fqe *fqe, 1266 u32 len); 1267 1268 /** 1269 * libeth_xdp_prepare_buff - fill &libeth_xdp_buff with head FQE data 1270 * @xdp: XDP buffer to attach the head to 1271 * @fqe: FQE containing the head buffer 1272 * @len: buffer len passed from HW 1273 * 1274 * Internal, use libeth_xdp_process_buff() instead. Initializes XDP buffer 1275 * head with the Rx buffer data: data pointer, length, headroom, and 1276 * truesize/tailroom. Zeroes the flags. 1277 * Uses faster single u64 write instead of per-field access. 1278 */ 1279 static inline void libeth_xdp_prepare_buff(struct libeth_xdp_buff *xdp, 1280 const struct libeth_fqe *fqe, 1281 u32 len) 1282 { 1283 const struct page *page = __netmem_to_page(fqe->netmem); 1284 1285 #ifdef __LIBETH_WORD_ACCESS 1286 static_assert(offsetofend(typeof(xdp->base), flags) - 1287 offsetof(typeof(xdp->base), frame_sz) == 1288 sizeof(u64)); 1289 1290 *(u64 *)&xdp->base.frame_sz = fqe->truesize; 1291 #else 1292 xdp_init_buff(&xdp->base, fqe->truesize, xdp->base.rxq); 1293 #endif 1294 xdp_prepare_buff(&xdp->base, page_address(page) + fqe->offset, > 1295 pp_page_to_nmdesc(page)->pp->p.offset, len, true); 1296 } 1297 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
