From e6c03c5b40314d787f7053f631594d6b1bd609e8 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 22 May 2009 14:14:22 +0100 Subject: drm: Memory fragmentation from lost alignment blocks If the block needs an alignment but otherwise fits exactly into the tail, then the split-off block from the start would remain marked as non-free. Signed-off-by: Chris Wilson Acked-by: Thomas Hellstrom Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_mm.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index 7819fd930a51..a912a0ff11cc 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -188,36 +188,34 @@ static struct drm_mm_node *drm_mm_split_at_start(struct drm_mm_node *parent, -struct drm_mm_node *drm_mm_get_block(struct drm_mm_node * parent, - unsigned long size, unsigned alignment) +struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *node, + unsigned long size, unsigned alignment) { struct drm_mm_node *align_splitoff = NULL; - struct drm_mm_node *child; unsigned tmp = 0; if (alignment) - tmp = parent->start % alignment; + tmp = node->start % alignment; if (tmp) { align_splitoff = - drm_mm_split_at_start(parent, alignment - tmp, 0); + drm_mm_split_at_start(node, alignment - tmp, 0); if (unlikely(align_splitoff == NULL)) return NULL; } - if (parent->size == size) { - list_del_init(&parent->fl_entry); - parent->free = 0; - return parent; + if (node->size == size) { + list_del_init(&node->fl_entry); + node->free = 0; } else { - child = drm_mm_split_at_start(parent, size, 0); + node = drm_mm_split_at_start(node, size, 0); } if (align_splitoff) drm_mm_put_block(align_splitoff); - return child; + return node; } EXPORT_SYMBOL(drm_mm_get_block); -- cgit v1.2.2