[Intel-gfx] [PATCH 29/49] drm/i915: Reduce the pointer dance of i915_is_ggtt()

[Chris Wilson]

The multiple levels of indirect do nothing but hinder the compiler and
the pointer chasing turns to be quite painful but painless to fix.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h     | 4 +---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 1 +
 drivers/gpu/drm/i915/i915_gem_gtt.h | 2 ++
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b728250d6550..209c9b612509 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2880,9 +2880,7 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj);
 	(&((struct drm_i915_private *)(obj)->base.dev->dev_private)->gtt.base)
 static inline bool i915_is_ggtt(struct i915_address_space *vm)
 {
-	struct i915_address_space *ggtt =
-		&((struct drm_i915_private *)(vm)->dev->dev_private)->gtt.base;
-	return vm == ggtt;
+	return vm->is_ggtt;
 }
 
 static inline struct i915_hw_ppgtt *
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e33b1214c4d8..68c1f49f2864 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2504,6 +2504,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
 		return ret;
 
 	gtt->base.dev = dev;
+	gtt->base.is_ggtt = true;
 
 	/* GMADR is the PCI mmio aperture into the global GTT. */
 	DRM_INFO("Memory usable by graphics device = %zdM\n",
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 3f0ad9f25441..20398a18a8a6 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -234,6 +234,8 @@ struct i915_address_space {
 	unsigned long start;		/* Start offset always 0 for dri2 */
 	size_t total;		/* size addr space maps (ex. 2GB for ggtt) */
 
+	bool is_ggtt;
+
 	struct {
 		dma_addr_t addr;
 		struct page *page;
-- 
2.1.4