From: Johannes Berg <johannes.berg@xxxxxxxxx>
We just map them to the normal rb_tree, losing the efficiency
gain in this case.
ticket=none
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
backport/backport-include/linux/rbtree.h | 25 ++++++++++++++++++++++++
patches/0104-rb-tree-cached.cocci | 5 +++++
2 files changed, 30 insertions(+)
create mode 100644 backport/backport-include/linux/rbtree.h
create mode 100644 patches/0104-rb-tree-cached.cocci
diff --git a/backport/backport-include/linux/rbtree.h b/backport/backport-include/linux/rbtree.h
new file mode 100644
index 000000000000..feccff36e7dd
--- /dev/null
+++ b/backport/backport-include/linux/rbtree.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2021 Intel Corporation
+ */
+#ifndef __BACKPORT_RBTREE_H
+#define __BACKPORT_RBTREE_H
+#include_next <linux/rbtree.h>
+
+#if LINUX_VERSION_IS_LESS(4,14,0)
+#define rb_root_cached rb_root
+#define rb_first_cached rb_first
+static inline void rb_insert_color_cached(struct rb_node *node,
+ struct rb_root_cached *root,
+ bool leftmost)
+{
+ rb_insert_color(node, root);
+}
+#define rb_erase_cached rb_erase
+#define RB_ROOT_CACHED RB_ROOT
+#define rb_root_node(root) (root)->rb_node
+#else
+#define rb_root_node(root) (root)->rb_root.rb_node
+#endif
+
+#endif /* __BACKPORT_RBTREE_H */
diff --git a/patches/0104-rb-tree-cached.cocci b/patches/0104-rb-tree-cached.cocci
new file mode 100644
index 000000000000..a8388c847a5a
--- /dev/null
+++ b/patches/0104-rb-tree-cached.cocci
@@ -0,0 +1,5 @@
+@@
+struct rb_root_cached *root;
+@@
+-root->rb_root.rb_node
++rb_root_node(root)
--
2.31.1
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