Hi Stanislav, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Stanislav-Fomichev/xdp-hints-via-kfuncs/20221115-110547 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20221115030210.3159213-7-sdf%40google.com patch subject: [PATCH bpf-next 06/11] xdp: Carry over xdp metadata into skb context config: arm64-randconfig-r001-20221115 compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 463da45892e2d2a262277b91b96f5f8c05dc25d0) 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 # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/5c7e4e60d13af8491563dd4d2ad5fc684420e540 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Stanislav-Fomichev/xdp-hints-via-kfuncs/20221115-110547 git checkout 5c7e4e60d13af8491563dd4d2ad5fc684420e540 # 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=arm64 SHELL=/bin/bash net/mac80211/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from net/mac80211/s1g.c:6: In file included from include/linux/ieee80211.h:20: In file included from include/linux/etherdevice.h:21: In file included from include/linux/netdevice.h:43: include/net/xdp.h:449:2: error: void function 'xdp_metadata_export_to_skb' should not return a value [-Wreturn-type] return 0; ^ ~ >> net/mac80211/s1g.c:103:36: warning: implicit conversion from 'unsigned long' to '__u16' (aka 'unsigned short') changes value from 18446744073709551614 to 65534 [-Wconstant-conversion] twt_agrt->req_type &= cpu_to_le16(~IEEE80211_TWT_REQTYPE_REQUEST); ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/byteorder/generic.h:90:21: note: expanded from macro 'cpu_to_le16' #define cpu_to_le16 __cpu_to_le16 ^ include/uapi/linux/byteorder/big_endian.h:36:53: note: expanded from macro '__cpu_to_le16' #define __cpu_to_le16(x) ((__force __le16)__swab16((x))) ~~~~~~~~~~^~~ include/uapi/linux/swab.h:107:12: note: expanded from macro '__swab16' __fswab16(x)) ~~~~~~~~~ ^ 1 warning and 1 error generated. vim +103 net/mac80211/s1g.c f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 94 f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 95 static void f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 96 ieee80211_s1g_rx_twt_setup(struct ieee80211_sub_if_data *sdata, f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 97 struct sta_info *sta, struct sk_buff *skb) f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 98 { f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 99 struct ieee80211_mgmt *mgmt = (void *)skb->data; f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 100 struct ieee80211_twt_setup *twt = (void *)mgmt->u.action.u.s1g.variable; f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 101 struct ieee80211_twt_params *twt_agrt = (void *)twt->params; f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 102 f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 @103 twt_agrt->req_type &= cpu_to_le16(~IEEE80211_TWT_REQTYPE_REQUEST); f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 104 f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 105 /* broadcast TWT not supported yet */ f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 106 if (twt->control & IEEE80211_TWT_CONTROL_NEG_TYPE_BROADCAST) { 7ff379ba2d4b7b Johannes Berg 2021-09-27 107 twt_agrt->req_type &= 7ff379ba2d4b7b Johannes Berg 2021-09-27 108 ~cpu_to_le16(IEEE80211_TWT_REQTYPE_SETUP_CMD); 7ff379ba2d4b7b Johannes Berg 2021-09-27 109 twt_agrt->req_type |= 7ff379ba2d4b7b Johannes Berg 2021-09-27 110 le16_encode_bits(TWT_SETUP_CMD_REJECT, f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 111 IEEE80211_TWT_REQTYPE_SETUP_CMD); f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 112 goto out; f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 113 } f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 114 30ac96f7cc973b Howard Hsu 2022-10-27 115 /* TWT Information not supported yet */ 30ac96f7cc973b Howard Hsu 2022-10-27 116 twt->control |= IEEE80211_TWT_CONTROL_RX_DISABLED; 30ac96f7cc973b Howard Hsu 2022-10-27 117 f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 118 drv_add_twt_setup(sdata->local, sdata, &sta->sta, twt); f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 119 out: f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 120 ieee80211_s1g_send_twt_setup(sdata, mgmt->sa, sdata->vif.addr, twt); f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 121 } f5a4c24e689f54 Lorenzo Bianconi 2021-08-23 122 -- 0-DAY CI Kernel Test Service https://01.org/lkp