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Adding test that attaches kprobe/kretprobe multi and verifies the ORC stacktrace matches expected functions. Adding bpf_testmod_stacktrace_test function to bpf_testmod kernel module which is called through several functions so we get reliable call path for stacktrace. The test is only for ORC unwinder to keep it simple. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20251104215405.168643-4-jolsa@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>