drm: mm: add helper to unwind scan state
With the switch to implicit free space accounting one pointer
got unused when scanning. Use it to create a single-linked list
to ensure correct unwinding of the scan state.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 17a070e..b1e7809 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -72,6 +72,7 @@
unsigned scanned_blocks;
unsigned long scan_start;
unsigned long scan_end;
+ struct drm_mm_node *prev_scanned_node;
};
static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
@@ -86,6 +87,13 @@
#define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
&(mm)->head_node.node_list, \
node_list);
+#define drm_mm_for_each_scanned_node_reverse(entry, n, mm) \
+ for (entry = (mm)->prev_scanned_node, \
+ next = entry ? list_entry(entry->node_list.next, \
+ struct drm_mm_node, node_list) : NULL; \
+ entry != NULL; entry = next, \
+ next = entry ? list_entry(entry->node_list.next, \
+ struct drm_mm_node, node_list) : NULL) \
/*
* Basic range manager support (drm_mm.c)
*/