Re: [PATCH 3/4] cgroup: Use __counted_by for cgroup::ancestors

[Tejun Heo]

On Thu, Dec 18, 2025 at 03:09:32PM +0800, Chen Ridong wrote:
> Note that this level may already be used in existing BPF programs (e.g.,
> tools/testing/selftests/bpf/progs/task_ls_uptr.c). Do we need to consider compatibility here?

That's a good point. Is __counted_by instrumentation tied to some compiler
flag? If so, might as well make it an optional extra field specifically for
the annotation rather than changing the meaning of an existing field.

Thanks.

-- 
tejun