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To avoid infinite nesting store recursive structs by pointer. If recursive struct is placed in the op directly - the first instance can be stored by value. That makes the code much less of a pain for majority of practical uses. Reviewed-by: Donald Hunter <donald.hunter@gmail.com> Link: https://lore.kernel.org/r/20231213231432.2944749-8-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>