drm/i915: Refactor unsettting obj->mm.pages
As i915_gem_object_phys_attach() wants to play dirty and mess around with obj->mm.pages itself (replacing the shmemfs with a DMA allocation), refactor the gubbins so into i915_gem_object_unset_pages() that we don't have to duplicate all the secrets. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180611075532.26534-1-chris@chris-wilson.co.uk Link: https://patchwork.freedesktop.org/patch/msgid/152871104647.1718.8796913290418060204@jlahtine-desk.ger.corp.intel.com
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