[merged mm-hotfixes-stable] maple_tree-detect-dead-nodes-in-mas_start.patch removed from -mm tree

[merged mm-hotfixes-stable] maple_tree-detect-dead-nodes-in-mas_start.patch removed from -mm tree

[Andrew Morton]

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