selftests/bpf: ensure we always have non-ambiguous sorting in veristat

Always fall back to unique file/prog comparison if user's custom order
specs are ambiguous. This ensures stable output no matter what.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20221103055304.2904589-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/veristat.c b/tools/testing/selftests/bpf/veristat.c
index f6f6a24..0da3ecf 100644 (file)
--- a/tools/testing/selftests/bpf/veristat.c
+++ b/tools/testing/selftests/bpf/veristat.c
@@ -723,7 +723,11 @@ static int cmp_prog_stats(const void *v1, const void *v2)
                        return cmp;
        }
 
-       return 0;
+       /* always disambiguate with file+prog, which are unique */
+       cmp = strcmp(s1->file_name, s2->file_name);
+       if (cmp != 0)
+               return cmp;
+       return strcmp(s1->prog_name, s2->prog_name);
 }
 
 #define HEADER_CHAR '-'