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

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Message-ID: <87cy8ppqtw.fsf@linux.dev>
Date: Wed, 20 Aug 2025 15:32:11 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Kumar Kartikeya Dwivedi <memxor@...il.com>
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

Kumar Kartikeya Dwivedi <memxor@...il.com> writes:

> 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>

Thanks!