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In the add_map() function, for each level it populates, it iterates from the root of the PT tree, making it ineficient if a mapping needs to occur past level 1. Instead, replace it with a recursive (and much simpler) algorithm that keeps the complexity as low as possible. With this, mapping 512GB at level 2 goes from several seconds down to not measurable on an A55 machine. We keep the block mappings at level 1 for now though. Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Pierre-Clément Tosi <ptosi@google.com> [ Paul: pick from the Android tree. Fixup Pierre's commit. Rebase to the upstream ] Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org> Cc: Tom Rini <trini@konsulko.com> Link:96ad729cf4Link:6be9330601