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Thu, 12 Feb 2026 16:14:50 -0800 (PST) Message-ID: Date: Thu, 12 Feb 2026 16:14:48 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next 1/3] selftests/bpf: Check bpf_mem_cgroup_page_state return value To: Hui Zhu , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Hui Zhu , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org References: <042df9438d9e78bcd66f1fa0e7043b9ea8cda96c.1770883926.git.zhuhui@kylinos.cn> Content-Language: en-US From: JP Kobryn In-Reply-To: <042df9438d9e78bcd66f1fa0e7043b9ea8cda96c.1770883926.git.zhuhui@kylinos.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/12/26 12:23 AM, Hui Zhu wrote: > From: Hui Zhu > > When back-porting test_progs to different kernel versions, I encountered > an issue where the test_cgroup_iter_memcg test would falsely pass even > when bpf_mem_cgroup_page_state() failed. > > The problem occurs when test_progs compiled on one kernel version is > executed on another kernel with different enum values for memory > statistics (e.g., NR_ANON_MAPPED, NR_FILE_PAGES). [...] This patch looks good but I think to fully solve this cross-kernel issue we should use co-re in the bpf program. In your second revision, can you add an additional patch to make use of bpf_core_enum_value()? This way instead of relying on enum values in vmlinux.h at compile-time, we use the btf info at load-time instead to get the proper value for the given kernel.