drm/i915: shrinker_control->nr_to_scan is now unsigned long

As the shrinker_control now passes us unsigned long targets, update our
shrinker functions to match.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -3203,7 +3203,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 
 /* i915_gem_shrinker.c */
 unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,
-			      long target,
+			      unsigned long target,
 			      unsigned flags);
 #define I915_SHRINK_PURGEABLE 0x1
 #define I915_SHRINK_UNBOUND 0x2

drivers/gpu/drm/i915/i915_gem_shrinker.c

@@ -73,7 +73,7 @@ static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task)
  */
 unsigned long
 i915_gem_shrink(struct drm_i915_private *dev_priv,
-		long target, unsigned flags)
+		unsigned long target, unsigned flags)
 {
 	const struct {
 		struct list_head *list;
@@ -159,7 +159,7 @@ i915_gem_shrink(struct drm_i915_private *dev_priv,
 unsigned long i915_gem_shrink_all(struct drm_i915_private *dev_priv)
 {
 	i915_gem_evict_everything(dev_priv->dev);
-	return i915_gem_shrink(dev_priv, LONG_MAX,
+	return i915_gem_shrink(dev_priv, -1UL,
 			       I915_SHRINK_BOUND | I915_SHRINK_UNBOUND);
 }