drm: Make sure the DRM offset matches the CPU
The pgoff option in mmap() is defined as an unsigned long so the offset generated by DRM needs to fit into BITS_PER_LONG for the CPU in question. Signed-off-by: NJordan Crouse <jcrouse@codeaurora.org> Signed-off-by: NDave Airlie <airlied@redhat.com>
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