[merged mm-stable] maple_tree-fix-alloc-node-fail-issue.patch removed from -mm tree

[merged mm-stable] maple_tree-fix-alloc-node-fail-issue.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: maple_tree: fix alloc node fail issue
has been removed from the -mm tree.  Its filename was
     maple_tree-fix-alloc-node-fail-issue.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Jiazi Li <jqqlijiazi@gmail.com>
Subject: maple_tree: fix alloc node fail issue
Date: Wed, 26 Jun 2024 12:06:30 -0400

In the following code, the second call to the mas_node_count will return
-ENOMEM:

	mas_node_count(mas, MAPLE_ALLOC_SLOTS + 1);
	mas_node_count(mas, MAPLE_ALLOC_SLOTS * 2 + 2);

This is because there may be some full maple_alloc node in current maple
state.  Use full maple_alloc node will make max_req equal to 0.  And it
leads to mt_alloc_bulk return 0.  As a result, mas_node_count set mas.node
to MA_ERROR(-ENOMEM).

Find a non-full maple_alloc node, and if necessary, use this non-full node
in the next while loop.

Link: https://lkml.kernel.org/r/20240626160631.3636515-1-Liam.Howlett@oracle.com
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Signed-off-by: Jiazi Li <jqqlijiazi@gmail.com>
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Suggested-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/maple_tree.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/lib/maple_tree.c~maple_tree-fix-alloc-node-fail-issue
+++ a/lib/maple_tree.c
@@ -1285,7 +1285,10 @@ static inline void mas_alloc_nodes(struc
 
 		node->node_count += count;
 		allocated += count;
-		node = node->slot[0];
+		/* find a non-full node*/
+		do {
+			node = node->slot[0];
+		} while (unlikely(node->node_count == MAPLE_ALLOC_SLOTS));
 		requested -= count;
 	}
 	mas->alloc->total = allocated;
_

Patches currently in -mm which might be from jqqlijiazi@gmail.com are