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We don't necessarily want to allocate the root CS chunk upfront if we don't know if there will be instructions emitted on the CS. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30695>