drm/i915: Rename ring->virtual_start as ring->vaddr

Just a different colour to better match virtual addresses elsewhere.

s/ring->virtual_start/ring->vaddr/

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1469005202-9659-9-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469017917-15134-8-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index d1b2d9b..05bab8b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -84,7 +84,7 @@
 
 struct intel_ringbuffer {
 	struct drm_i915_gem_object *obj;
-	void *virtual_start;
+	void *vaddr;
 	struct i915_vma *vma;
 
 	struct intel_engine_cs *engine;
@@ -457,7 +457,7 @@
 static inline void __intel_ringbuffer_emit(struct intel_ringbuffer *rb,
 					   u32 data)
 {
-	*(uint32_t *)(rb->virtual_start + rb->tail) = data;
+	*(uint32_t *)(rb->vaddr + rb->tail) = data;
 	rb->tail += 4;
 }