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Names used to pin eBPF programs and maps under the eBPF virtual file system cannot contain a dot character, which is reserved for future extensions of this file system. Document this in bpftool man pages to avoid users getting confused if pinning fails because of a dot. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>