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selftests/bpf: Fix the issue where the error code is 0

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The error message printed here only uses the previous err value,
which results in it being printed as 0.
When bpf_map__attach_struct_ops encounters an error,
it uses libbpf_err_ptr(err) to set errno = -err and returns NULL.
Therefore, Using -errno can fix this issue.

Fix before:
run_subtest:FAIL:1019 bpf_map__attach_struct_ops failed for map pro_epilogue: err=0

Fix after:
run_subtest:FAIL:1019 bpf_map__attach_struct_ops failed for map pro_epilogue: err=-9

Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250908060810.1054341-1-yangfeng59949@163.com
This commit is contained in:
Feng Yang 2025-09-08 14:08:10 +08:00 committed by Martin KaFai Lau
parent e12873ee85
commit 93a83d0443
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/test_loader.c
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@ -1088,7 +1088,7 @@ void run_subtest(struct test_loader *tester,
link = bpf_map__attach_struct_ops(map);
if (!link) {
PRINT_FAIL("bpf_map__attach_struct_ops failed for map %s: err=%d\n",
bpf_map__name(map), err);
bpf_map__name(map), -errno);
goto tobj_cleanup;
}
links[links_cnt++] = link;