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The fsession is something that similar to kprobe session. It allow to attach a single BPF program to both the entry and the exit of the target functions. Introduce the struct bpf_fsession_link, which allows to add the link to both the fentry and fexit progs_hlist of the trampoline. Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn> Co-developed-by: Leon Hwang <leon.hwang@linux.dev> Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Link: https://lore.kernel.org/r/20260124062008.8657-2-dongml2@chinatelecom.cn Signed-off-by: Alexei Starovoitov <ast@kernel.org>