Hi Andrii, I love your patch! Yet something to improve: [auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Andrii-Nakryiko/bpf-add-ambient-... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: nios2-randconfig-p001-20210710 (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/e66ab92194c9a54bde72690e56df1c260... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andrii-Nakryiko/bpf-add-ambient-BPF-runtime-context-stored-in-current/20210710-091156 git checkout e66ab92194c9a54bde72690e56df1c2602b06ae4 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash drivers/iio/humidity/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/memcontrol.h:13, from include/linux/swap.h:9, from include/linux/suspend.h:5, from include/linux/regulator/consumer.h:35, from drivers/iio/humidity/hts221.h:16, from drivers/iio/humidity/hts221_core.c:19: include/linux/bpf.h: In function 'bpf_set_run_ctx': 1120 | old_ctx = current->bpf_ctx; | ^~ include/linux/bpf.h:1121:9: error: 'struct task_struct' has no member named 'bpf_ctx' 1121 | current->bpf_ctx = new_ctx; | ^~ include/linux/bpf.h: In function 'bpf_reset_run_ctx': include/linux/bpf.h:1127:9: error: 'struct task_struct' has no member named 'bpf_ctx' 1127 | current->bpf_ctx = old_ctx; | ^~ -- In file included from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/memcontrol.h:13, from include/linux/swap.h:9, from include/linux/suspend.h:5, from include/linux/regulator/consumer.h:35, from drivers/iio/humidity/hts221.h:16, from drivers/iio/humidity/hts221_i2c.c:17: include/linux/bpf.h: In function 'bpf_set_run_ctx': 1120 | old_ctx = current->bpf_ctx; | ^~ include/linux/bpf.h:1121:9: error: 'struct task_struct' has no member named 'bpf_ctx' 1121 | current->bpf_ctx = new_ctx; | ^~ include/linux/bpf.h: In function 'bpf_reset_run_ctx': include/linux/bpf.h:1127:9: error: 'struct task_struct' has no member named 'bpf_ctx' 1127 | current->bpf_ctx = old_ctx; | ^~ At top level: drivers/iio/humidity/hts221_i2c.c:44:36: warning: 'hts221_acpi_match' defined but not used [-Wunused-const-variable=] 44 | static const struct acpi_device_id hts221_acpi_match[] = { | ^~~~~~~~~~~~~~~~~ vim +1120 include/linux/bpf.h 1115 1116 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx) 1117 { 1118 struct bpf_run_ctx *old_ctx; 1119 1121 current->bpf_ctx = new_ctx; 1122 return old_ctx; 1123 } 1124 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org