drm/i915: Use phys_addr_t for the address of stolen memory
Though we know the hw is limited to keeping stolen memory inside the first 4GiB, it is clearer to the reader that we are handling physical address if we use phys_addr_t to refer to the base of stolen memory. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170106152013.24684-2-chris@chris-wilson.co.uk
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