Hi Rong, kernel test robot noticed the following build warnings:
url: https://github.com/intel-lab-lkp/linux/commits/Rong-Tao/selftests-bpf-Add-selftests-for-bpf_task_cwd_from_pid/20250529-113933 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/tencent_97F8B56B340F51DB604B482FEBF012460505%40qq.com patch subject: [PATCH bpf-next 1/2] bpf: Add bpf_task_cwd_from_pid() kfunc config: x86_64-randconfig-161-20250529 (https://download.01.org/0day-ci/archive/20250530/202505300432.nzc50gou-...@intel.com/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 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 <l...@intel.com> | Reported-by: Dan Carpenter <dan.carpen...@linaro.org> | Closes: https://lore.kernel.org/r/202505300432.nzc50gou-...@intel.com/ smatch warnings: kernel/bpf/helpers.c:2687 bpf_task_cwd_from_pid() warn: inconsistent returns 'rcu_read'. vim +/rcu_read +2687 kernel/bpf/helpers.c b24383bde5a454 Rong Tao 2025-05-29 2657 __bpf_kfunc int bpf_task_cwd_from_pid(s32 pid, char *buf, u32 buf_len) b24383bde5a454 Rong Tao 2025-05-29 2658 { b24383bde5a454 Rong Tao 2025-05-29 2659 struct path pwd; b24383bde5a454 Rong Tao 2025-05-29 2660 char kpath[256], *path; b24383bde5a454 Rong Tao 2025-05-29 2661 struct task_struct *task; b24383bde5a454 Rong Tao 2025-05-29 2662 b24383bde5a454 Rong Tao 2025-05-29 2663 if (!buf || buf_len == 0) b24383bde5a454 Rong Tao 2025-05-29 2664 return -EINVAL; b24383bde5a454 Rong Tao 2025-05-29 2665 b24383bde5a454 Rong Tao 2025-05-29 2666 rcu_read_lock(); b24383bde5a454 Rong Tao 2025-05-29 2667 task = pid_task(find_vpid(pid), PIDTYPE_PID); b24383bde5a454 Rong Tao 2025-05-29 2668 if (!task) { b24383bde5a454 Rong Tao 2025-05-29 2669 rcu_read_unlock(); b24383bde5a454 Rong Tao 2025-05-29 2670 return -ESRCH; b24383bde5a454 Rong Tao 2025-05-29 2671 } b24383bde5a454 Rong Tao 2025-05-29 2672 task_lock(task); b24383bde5a454 Rong Tao 2025-05-29 2673 if (!task->fs) { b24383bde5a454 Rong Tao 2025-05-29 2674 task_unlock(task); b24383bde5a454 Rong Tao 2025-05-29 2675 return -ENOENT; rcu_read_unlock(); b24383bde5a454 Rong Tao 2025-05-29 2676 } b24383bde5a454 Rong Tao 2025-05-29 2677 get_fs_pwd(task->fs, &pwd); b24383bde5a454 Rong Tao 2025-05-29 2678 task_unlock(task); b24383bde5a454 Rong Tao 2025-05-29 2679 rcu_read_unlock(); b24383bde5a454 Rong Tao 2025-05-29 2680 b24383bde5a454 Rong Tao 2025-05-29 2681 path = d_path(&pwd, kpath, sizeof(kpath)); b24383bde5a454 Rong Tao 2025-05-29 2682 path_put(&pwd); b24383bde5a454 Rong Tao 2025-05-29 2683 if (IS_ERR(path)) b24383bde5a454 Rong Tao 2025-05-29 2684 return PTR_ERR(path); b24383bde5a454 Rong Tao 2025-05-29 2685 b24383bde5a454 Rong Tao 2025-05-29 2686 strncpy(buf, path, buf_len); b24383bde5a454 Rong Tao 2025-05-29 @2687 return 0; b24383bde5a454 Rong Tao 2025-05-29 2688 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
