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Andrii Nakryiko authored
Factor out common piece of logic that detects support for a feature based on successfully created FD. Also take care of closing FD, if it was created. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200818213356.2629020-4-andriin@fb.com
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