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>

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