The quilt patch titled Subject: maple_tree: detect dead nodes in mas_start() has been removed from the -mm tree. Its filename was maple_tree-detect-dead-nodes-in-mas_start.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: Liam Howlett Liam.Howlett@oracle.com Subject: maple_tree: detect dead nodes in mas_start() Date: Mon, 27 Feb 2023 09:36:01 -0800

When initially starting a search, the root node may already be in the process of being replaced in RCU mode. Detect and restart the walk if this is the case. This is necessary for RCU mode of the maple tree.

Link: https://lkml.kernel.org/r/20230227173632.3292573-3-surenb@google.com Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Liam Howlett Liam.Howlett@oracle.com Signed-off-by: Suren Baghdasaryan surenb@google.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

lib/maple_tree.c | 4 ++++ 1 file changed, 4 insertions(+)

--- a/lib/maple_tree.c~maple_tree-detect-dead-nodes-in-mas_start +++ a/lib/maple_tree.c @@ -1360,12 +1360,16 @@ static inline struct maple_enode *mas_st mas->max = ULONG_MAX; mas->depth = 0;

+retry: root = mas_root(mas); /* Tree with nodes */ if (likely(xa_is_node(root))) { mas->depth = 1; mas->node = mte_safe_root(root); mas->offset = 0; + if (mte_dead_node(mas->node)) + goto retry; + return NULL; }

_

Patches currently in -mm which might be from Liam.Howlett@oracle.com are