gma500: Ensure the frame buffer has a linear virtual mapping
We need this for the framebuffer in order to ensure that the kernel framebuffer layer can handle it when using KMS. Except for the base framebuffer this isn't a concern. Add an npage field to the gtt as too many copies of the page calculation are getting spread around the code. Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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