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drm/i915: Refactor common list iteration over GGTT vma
In quite a few places, we have a list iteration over the vma on an object that only want to inspect GGTT vma. By construction, these are placed at the start of the list, so we have copied that knowledge into many callsites. Pull that knowledge back to i915_vma.h and provide a for_each_ggtt_vma() to tidy up the code. v2: Add a backreference from vma_create() to remind ourselves why we put ggtt vma at the head of the obj->vma_list (and ppgtt vma at the tail). v3: Fixup s/vma/V/ Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20171207211407.31549-1-chris@chris-wilson.co.uk
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