Merge branch 'bpf: Fixes for kprobe multi on kernel modules'

Jiri Olsa says:

====================

hi,
Martynas reported kprobe _multi link does not resolve symbols
from kernel modules, which attach by address works.

In addition while fixing that I realized we do not take module
reference if the module has kprobe_multi link on top of it and
can be removed.

There's mo crash related to this, it will silently disappear from
ftrace tables, while kprobe_multi link stays up with no data.

This patchset has fixes for both issues.

v3 changes:
  - reorder fields in struct bpf_kprobe_multi_link [Andrii]
  - added ack [Andrii]

v2 changes:
  - added acks (Song)
  - added comment to kallsyms_callback (Song)
  - change module_callback realloc logic (Andrii)
  - get rid of macros in tests (Andrii)

thanks,
jirka
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/module_attach.c b/tools/testing/selftests/bpf/prog_tests/module_attach.c
index 6d0e50dcf47c..7fc01ff490db 100644
--- a/tools/testing/selftests/bpf/prog_tests/module_attach.c
+++ b/tools/testing/selftests/bpf/prog_tests/module_attach.c
@@ -103,6 +103,13 @@ void test_module_attach(void)
 	ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
 	bpf_link__destroy(link);
 
+	link = bpf_program__attach(skel->progs.kprobe_multi);
+	if (!ASSERT_OK_PTR(link, "attach_kprobe_multi"))
+		goto cleanup;
+
+	ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
+	bpf_link__destroy(link);
+
 cleanup:
 	test_module_attach__destroy(skel);
 }