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Useful when the page is already mapped to copy date in/out. For -stable because the next patch (fixing phys obj pwrite) needs this little helper function. Tested-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>