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Allow the mapping code to request a specific virtual address for the gem mapping. If the virtual address is zero we fall back to the old mode of allocating a virtual address for the mapping. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Guido Günther <agx@sigxcpu.org>