bpf_task_under_cgroup
BTF_ID_FLAGS(func, bpf_task_under_cgroup, KF_RCU)
long bpf_task_under_cgroup(struct task_struct *task, struct cgroup *ancestor) __ksym;
if (bpf_task_under_cgroup(acquired, cgrp))
if (!bpf_task_under_cgroup(task, cgrp))