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We try to keep the structures and helpers "topologically sorted", to avoid forward declarations. When recursive nests are at play we need to sort twice, because structs which end up being marked as recursive will get a full set of forward declarations, so we should ignore them for the purpose of sorting. Reviewed-by: Donald Hunter <donald.hunter@gmail.com> Link: https://lore.kernel.org/r/20231213231432.2944749-7-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>