linux-kernel - Re: [PATCH v1 02/14] bpf: mark struct oom_control's memcg field as TRUSTED_OR

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Message-ID: <CAP01T767o1-KyhRLGcm8gXU5GiY8_OtifT6bNVfMuf+MT+3ZBw@mail.gmail.com>
Date: Wed, 20 Aug 2025 11:17:38 +0200
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: linux-mm@...ck.org, bpf@...r.kernel.org, 
	Suren Baghdasaryan <surenb@...gle.com>, Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...e.com>, 
	David Rientjes <rientjes@...gle.com>, Matt Bobrowski <mattbobrowski@...gle.com>, 
	Song Liu <song@...nel.org>, Alexei Starovoitov <ast@...nel.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 02/14] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL

On Mon, 18 Aug 2025 at 19:01, Roman Gushchin <roman.gushchin@...ux.dev> wrote:
>
> Struct oom_control is used to describe the OOM context.
> It's memcg field defines the scope of OOM: it's NULL for global
> OOMs and a valid memcg pointer for memcg-scoped OOMs.
> Teach bpf verifier to recognize it as trusted or NULL pointer.
> It will provide the bpf OOM handler a trusted memcg pointer,
> which for example is required for iterating the memcg's subtree.
>
> Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
> ---

Acked-by: Kumar Kartikeya Dwivedi <memxor@...il.com>