linux-kernel - [PATCH bpf-next 3/3] selftests/bpf: Allow -ENOMEM on LRU map updates

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Message-ID: <20260119142120.28170-4-leon.hwang@linux.dev>
Date: Mon, 19 Jan 2026 22:21:20 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: bpf@...r.kernel.org
Cc: Martin KaFai Lau <martin.lau@...ux.dev>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Leon Hwang <leon.hwang@...ux.dev>,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	kernel-patches-bot@...com
Subject: [PATCH bpf-next 3/3] selftests/bpf: Allow -ENOMEM on LRU map updates

LRU hash map updates may legitimately return -ENOMEM. Relax the percpu
stats selftest to accept that error for LRU map types so it matches the
map's expected behavior.

Signed-off-by: Leon Hwang <leon.hwang@...ux.dev>
---
 tools/testing/selftests/bpf/map_tests/map_percpu_stats.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
index 1c7c04288eff..d510a9c54978 100644
--- a/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
+++ b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
@@ -188,7 +188,8 @@ static void *patch_map_thread(void *arg)
 						   40, retry_for_nomem_fn);
 		else
 			ret = bpf_map_update_elem(opts->map_fd, &i, val_ptr, 0);
-		CHECK(ret < 0, "bpf_map_update_elem", "key=%d error: %s\n", i, strerror(errno));
+		CHECK(ret < 0 && (!is_lru(opts->map_type) || ret != -ENOMEM),
+		      "bpf_map_update_elem", "key=%d error: %s\n", i, strerror(errno));
 
 		if (opts->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
 			close(val);
-- 
2.52.0