The quilt patch titled Subject: maple_tree: fix mt_destroy_walk() on root leaf node has been removed from the -mm tree. Its filename was maple_tree-fix-mt_destroy_walk-on-root-leaf-node.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Wei Yang richard.weiyang@gmail.com Subject: maple_tree: fix mt_destroy_walk() on root leaf node Date: Tue, 24 Jun 2025 15:18:40 -0400
On destroy, we should set each node dead. But current code miss this when the maple tree has only the root node.
The reason is mt_destroy_walk() leverage mte_destroy_descend() to set node dead, but this is skipped since the only root node is a leaf.
Fixes this by setting the node dead if it is a leaf.
Link: https://lore.kernel.org/all/20250407231354.11771-1-richard.weiyang@gmail.com... Link: https://lkml.kernel.org/r/20250624191841.64682-1-Liam.Howlett@oracle.com Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Wei Yang richard.weiyang@gmail.com Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com Reviewed-by: Dev Jain dev.jain@arm.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
lib/maple_tree.c | 1 + 1 file changed, 1 insertion(+)
--- a/lib/maple_tree.c~maple_tree-fix-mt_destroy_walk-on-root-leaf-node +++ a/lib/maple_tree.c @@ -5319,6 +5319,7 @@ static void mt_destroy_walk(struct maple struct maple_enode *start;
if (mte_is_leaf(enode)) { + mte_set_node_dead(enode); node->type = mte_node_type(enode); goto free_leaf; } _
Patches currently in -mm which might be from richard.weiyang@gmail.com are
mm-migrate-remove-the-eexist-conversion-for-move_pages.patch