> Allow kprobe tracepoint events creation through legacy interface, as the > kprobe dynamic PMUs support, used by default, was only created in v4.17. > > After commit "bpf: implement minimal BPF perf link", it was allowed that > some extra - to the link - information is accessed through container_of > struct bpf_link. This allows the tracing perf event legacy name, and > information whether it is a retprobe, to be saved outside bpf_link > structure, which would not be optimal. > > This enables CO-RE support for older kernels. > > Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> > Signed-off-by: Rafael David Tinoco <rafaeldtinoco@xxxxxxxxx> Tested using: https://github.com/rafaeldtinoco/portablebpf Single execution: # cat kernel/debug/tracing/kprobe_events p:kprobes/tcp_connect_libbpf_20166 tcp_connect r4:kretprobes/tcp_connect_libbpf_20166 tcp_connect Simultaneous execution: # cat kernel/debug/tracing/kprobe_events p:kprobes/tcp_connect_libbpf_20166 tcp_connect r4:kretprobes/tcp_connect_libbpf_20166 tcp_connect p:kprobes/tcp_connect_libbpf_20177 tcp_connect r4:kretprobes/tcp_connect_libbpf_20177 tcp_connect kprobe_events was cleared after execution.
