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With an explicit level, we can refactor the separate cleanup functions as a simple recursive function. We take the opportunity to pass down the size of each level so that we can deal with the different sizes of top-level and avoid over allocating for 32/36-bit vm. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190712112725.2892-2-chris@chris-wilson.co.uk