linux-kernel - Re: [PATCH 3/4] cgroup: Use __counted

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Message-ID: <aUQnRqJsjh9p9Vhb@slm.duckdns.org>
Date: Thu, 18 Dec 2025 06:09:42 -1000
From: Tejun Heo <tj@...nel.org>
To: Chen Ridong <chenridong@...weicloud.com>
Cc: Michal Koutný <mkoutny@...e.com>,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	Johannes Weiner <hannes@...xchg.org>, Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH 3/4] cgroup: Use __counted_by for cgroup::ancestors

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