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Adding support to use session attachment with tracing_multi link. Adding new BPF_TRACE_FSESSION_MULTI program attach type, that follows the BPF_TRACE_FSESSION behaviour but on the tracing_multi link. Such program is called on entry and exit of the attached function and allows to pass cookie value from entry to exit execution. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20260606123955.345967-16-jolsa@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>