drm: Simplify drm_mm_clean()

Since commit ea7b1dd44867 ("drm: mm: track free areas implicitly"),
to test whether there are any nodes allocated within the range manager,
we merely have to ask whether the node_list is empty.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-25-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 370cb8e..e0419cf 100644 (file)
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -873,22 +873,6 @@ bool drm_mm_scan_remove_block(struct drm_mm_node *node)
 EXPORT_SYMBOL(drm_mm_scan_remove_block);
 
 /**
- * drm_mm_clean - checks whether an allocator is clean
- * @mm: drm_mm allocator to check
- *
- * Returns:
- * True if the allocator is completely free, false if there's still a node
- * allocated in it.
- */
-bool drm_mm_clean(const struct drm_mm *mm)
-{
-       const struct list_head *head = drm_mm_nodes(mm);
-
-       return (head->next->next == head);
-}
-EXPORT_SYMBOL(drm_mm_clean);
-
-/**
  * drm_mm_init - initialize a drm-mm allocator
  * @mm: the drm_mm structure to initialize
  * @start: start of the range managed by @mm
@@ -928,10 +912,9 @@ EXPORT_SYMBOL(drm_mm_init);
  */
 void drm_mm_takedown(struct drm_mm *mm)
 {
-       if (WARN(!list_empty(drm_mm_nodes(mm)),
+       if (WARN(!drm_mm_clean(mm),
                 "Memory manager not clean during takedown.\n"))
                show_leaks(mm);
-
 }
 EXPORT_SYMBOL(drm_mm_takedown);
 

diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 7eeb98b..72e0c0d 100644 (file)
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -342,7 +342,19 @@ void drm_mm_remove_node(struct drm_mm_node *node);
 void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
 void drm_mm_init(struct drm_mm *mm, u64 start, u64 size);
 void drm_mm_takedown(struct drm_mm *mm);
-bool drm_mm_clean(const struct drm_mm *mm);
+
+/**
+ * drm_mm_clean - checks whether an allocator is clean
+ * @mm: drm_mm allocator to check
+ *
+ * Returns:
+ * True if the allocator is completely free, false if there's still a node
+ * allocated in it.
+ */
+static inline bool drm_mm_clean(const struct drm_mm *mm)
+{
+       return list_empty(drm_mm_nodes(mm));
+}
 
 struct drm_mm_node *
 __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last);