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Store collected kfuncs in a rbtree keyed by BTF ID instead of a dynamically grown array. This allows for efficient deduplication for kfuncs declared in multiple sets, which is needed for subsequent patches [1]. [1] https://lore.kernel.org/bpf/CAEf4BzaLzX3mXvQzxv+gbmZOh84XvYofLjMSWFYghNjS-ohEZg@mail.gmail.com/ Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20260722233518.778854-4-ihor.solodrai@linux.dev