Since we mandate a strict reverse-order of drm_mm_scan_remove_block()
after drm_mm_scan_add_block() we can further simplify the list
manipulations when generating the temporary scan-hole.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/drm_mm.c | 22 +++++-----------------
include/drm/drm_mm.h | 7 +------
2 files changed, 6 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 7245483f1111..ba1a244fe6e5 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -518,9 +518,7 @@ void drm_mm_remove_node(struct drm_mm_node *node)
struct drm_mm_node *prev_node;
DRM_MM_BUG_ON(!node->allocated);
- DRM_MM_BUG_ON(node->scanned_block ||
- node->scanned_prev_free ||
- node->scanned_next_free);
+ DRM_MM_BUG_ON(node->scanned_block);
prev_node =
list_entry(node->node_list.prev, struct drm_mm_node, node_list);
@@ -756,8 +754,6 @@ void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,
scan->hit_start = 0;
scan->hit_end = 0;
-
- scan->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_scan_init_with_range);
@@ -787,13 +783,8 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
mm->scan_active++;
hole = list_prev_entry(node, node_list);
-
- node->scanned_preceeds_hole = hole->hole_follows;
- hole->hole_follows = 1;
- list_del(&node->node_list);
- node->node_list.prev = &hole->node_list;
- node->node_list.next = &scan->prev_scanned_node->node_list;
- scan->prev_scanned_node = node;
+ DRM_MM_BUG_ON(list_next_entry(hole, node_list) != node);
+ __list_del_entry(&node->node_list);
hole_start = __drm_mm_hole_node_start(hole);
hole_end = __drm_mm_hole_node_end(hole);
@@ -887,8 +878,8 @@ bool drm_mm_scan_remove_block(struct drm_mm_scan *scan,
node->mm->scan_active--;
prev_node = list_prev_entry(node, node_list);
-
- prev_node->hole_follows = node->scanned_preceeds_hole;
+ DRM_MM_BUG_ON(list_next_entry(prev_node, node_list) !=
+ list_next_entry(node, node_list));
list_add(&node->node_list, &prev_node->node_list);
return (node->start + node->size > scan->hit_start &&
@@ -913,9 +904,6 @@ void drm_mm_init(struct drm_mm *mm, u64 start, u64 size)
INIT_LIST_HEAD(&mm->head_node.node_list);
mm->head_node.allocated = 0;
mm->head_node.hole_follows = 1;
- mm->head_node.scanned_block = 0;
- mm->head_node.scanned_prev_free = 0;
- mm->head_node.scanned_next_free = 0;
mm->head_node.mm = mm;
mm->head_node.start = start + size;
mm->head_node.size = start - mm->head_node.start;
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 90d607e31301..4ff76d0ab849 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -73,11 +73,8 @@ struct drm_mm_node {
struct list_head hole_stack;
struct rb_node rb;
unsigned hole_follows : 1;
- unsigned scanned_block : 1;
- unsigned scanned_prev_free : 1;
- unsigned scanned_next_free : 1;
- unsigned scanned_preceeds_hole : 1;
unsigned allocated : 1;
+ bool scanned_block : 1;
unsigned long color;
u64 start;
u64 size;
@@ -117,8 +114,6 @@ struct drm_mm_scan {
u64 hit_start;
u64 hit_end;
- struct drm_mm_node *prev_scanned_node;
-
unsigned long color;
unsigned int flags;
};
--
2.11.0
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