On 10/1/22 7:47 AM, David Vernet wrote:
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index b069517a3da0..36cbe1b8f8b1 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1700,20 +1700,93 @@ bpf_base_func_proto(enum bpf_func_id func_id)
}
}
-BTF_SET8_START(tracing_btf_ids)
+__diag_push();
+__diag_ignore_all("-Wmissing-prototypes",
+ "Global functions as their definitions will be in vmlinux BTF");
+
+/**
+ * bpf_task_acquire - Acquire a reference to a task. A task acquired by this
+ * kfunc which is not stored in a map as a kptr, must be released by calling
+ * bpf_task_release().
+ * @p: The task on which a reference is being acquired.
+ */
+__used noinline
+struct task_struct *bpf_task_acquire(struct task_struct *p)
+{
+ refcount_inc(&p->rcu_users);
This probably needs to be refcount_inc_not_zero() also for the cases like during
the task free tracepoint ?
