selftest/bpf: Fix kprobe_multi bench test

With [1] the available_filter_functions file contains records
starting with __ftrace_invalid_address___ and marking disabled
entries.

We need to filter them out for the bench test to pass only
resolvable symbols to kernel.

[1] commit b39181f7c690 ("ftrace: Add FTRACE_MCOUNT_MAX_OFFSET to avoid adding weak function")

Fixes: b39181f7c690 ("ftrace: Add FTRACE_MCOUNT_MAX_OFFSET to avoid adding weak function")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220615112118.497303-5-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
index 586dc52d6fb960b674e40aad6fcbec1bd89afb2f..5b93d5d0bd9318228504902ce712fc203328416a 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
@@ -364,6 +364,9 @@ static int get_syms(char ***symsp, size_t *cntp)
                        continue;
                if (!strncmp(name, "rcu_", 4))
                        continue;
+               if (!strncmp(name, "__ftrace_invalid_address__",
+                            sizeof("__ftrace_invalid_address__") - 1))
+                       continue;
                err = hashmap__add(map, name, NULL);
                if (err) {
                        free(name);