From: bot+bpf-ci@kernel.org
To: hui.zhu@linux.dev,hannes@cmpxchg.org,mhocko@kernel.org,roman.gushchin@linux.dev,shakeel.butt@linux.dev,muchun.song@linux.dev,akpm@linux-foundation.org,ast@kernel.org,daniel@iogearbox.net,andrii@kernel.org,martin.lau@linux.dev,eddyz87@gmail.com,song@kernel.org,yonghong.song@linux.dev,john.fastabend@gmail.com,kpsingh@kernel.org,sdf@fomichev.me,haoluo@google.com,jolsa@kernel.org,shuah@kernel.org,zhuhui@kylinos.cn,inwardvessel@gmail.com,cgroups@vger.kernel.org,linux-mm@kvack.org,linux-kernel@vger.kernel.org,bpf@vger.kernel.org,linux-kselftest@vger.kernel.org
Cc: ast@kernel.org,andrii@kernel.org,daniel@iogearbox.net,martin.lau@kernel.org,eddyz87@gmail.com,yonghong.song@linux.dev,clm@meta.com,ihor.solodrai@linux.dev
Subject: Re: [PATCH bpf-next v2 2/3] selftests/bpf: Check bpf_mem_cgroup_page_state return value
Date: Fri, 13 Feb 2026 07:56:56 +0000 (UTC) [thread overview]
Message-ID: <1d048c48e087e02590e6943bdfed93db4202f3c600155483cc38cea21e565f8b@mail.kernel.org> (raw)
In-Reply-To: <ba61b77c71b6285eefa022a84bf80c5913b313de.1770965805.git.zhuhui@kylinos.cn>
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> diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c b/tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c
> --- a/tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c
> +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c
[ ... ]
> @@ -143,6 +151,8 @@ static void test_kmem(struct bpf_link *link, struct memcg_query *memcg_query)
> if (!ASSERT_OK(read_stats(link), "read stats"))
> goto cleanup;
>
> + ASSERT_NEQ(memcg_query->memcg_kmem, (unsigned long)-1,
> + "bpf_mem_cgroup_vm_events MEMCG_KMEM");
Should this assertion string say "bpf_mem_cgroup_page_state MEMCG_KMEM"
instead? The BPF program in progs/cgroup_iter_memcg.c populates
memcg_kmem using bpf_mem_cgroup_page_state(), not
bpf_mem_cgroup_vm_events():
idx = bpf_core_enum_value(enum memcg_stat_item, MEMCG_KMEM);
...
memcg_query.memcg_kmem = bpf_mem_cgroup_page_state(memcg, idx);
> @@ -170,6 +180,8 @@ static void test_pgfault(struct bpf_link *link, struct memcg_query *memcg_query)
> if (!ASSERT_OK(read_stats(link), "read stats"))
> goto cleanup;
>
> + ASSERT_NEQ(memcg_query->pgfault, (unsigned long)-1,
> + "bpf_mem_cgroup_page_state PGFAULT");
Similarly, should this say "bpf_mem_cgroup_vm_events PGFAULT"? The BPF
program retrieves pgfault using bpf_mem_cgroup_vm_events():
idx = bpf_core_enum_value(enum vm_event_item, PGFAULT);
...
memcg_query.pgfault = bpf_mem_cgroup_vm_events(memcg, idx);
It looks like the two assertion description strings for test_kmem and
test_pgfault were swapped.
---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md
CI run summary: https://github.com/kernel-patches/bpf/actions/runs/21978734425
AI-authorship-score: low
AI-authorship-explanation: The commit describes a specific back-porting scenario, and the copy-paste error in swapped assertion strings is characteristic of human authorship.
issues-found: 2
issue-severity-score: low
issue-severity-explanation: Two assertion description strings are swapped between test_kmem and test_pgfault, producing misleading diagnostics on test failure but not affecting test correctness or system stability.
next prev parent reply other threads:[~2026-02-13 7:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-13 7:23 [PATCH bpf-next v2 0/3] Fix test_cgroup_iter_memcg issues found during back-porting Hui Zhu
2026-02-13 7:23 ` [PATCH bpf-next v2 1/3] bpf: Use bpf_core_enum_value for stats in cgroup_iter_memcg Hui Zhu
2026-02-16 18:30 ` JP Kobryn (Meta)
2026-02-13 7:23 ` [PATCH bpf-next v2 2/3] selftests/bpf: Check bpf_mem_cgroup_page_state return value Hui Zhu
2026-02-13 7:56 ` bot+bpf-ci [this message]
2026-02-13 7:23 ` [PATCH bpf-next v2 3/3] bpf: selftests: Skip kmem test when cgroup.memory=nokmem is set Hui Zhu
2026-02-13 7:56 ` bot+bpf-ci
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