diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 107f09b..b4b79a5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4027,6 +4027,7 @@ int i915_gem_init(struct drm_device *dev)
 
 	gtt_size = dev_priv->mm.gtt->gtt_total_entries << PAGE_SHIFT;
 	mappable_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
+	gtt_size = mappable_size;
 
 	mutex_lock(&dev->struct_mutex);
 	if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {