From 408925e54b079e2c9c41c48c3a38b94dda235a36 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 14 Aug 2020 17:08:41 +0200
Subject: [PATCH 166/327] locking: split out the rbtree definition

rtmutex.h needs the definition for rb_root_cached. By including kernel.h
we will get to spinlock.h which requires rtmutex.h again.

Split out the required struct definition and move it into its own header
file which can be included by rtmutex.h

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 include/linux/rbtree.h      | 27 +--------------------------
 include/linux/rbtree_type.h | 31 +++++++++++++++++++++++++++++++
 include/linux/rtmutex.h     |  2 +-
 3 files changed, 33 insertions(+), 27 deletions(-)
 create mode 100644 include/linux/rbtree_type.h

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index d7db17996322..c33b0e16d04b 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -19,19 +19,9 @@
 
 #include <linux/kernel.h>
 #include <linux/stddef.h>
+#include <linux/rbtree_type.h>
 #include <linux/rcupdate.h>
 
-struct rb_node {
-	unsigned long  __rb_parent_color;
-	struct rb_node *rb_right;
-	struct rb_node *rb_left;
-} __attribute__((aligned(sizeof(long))));
-    /* The alignment might seem pointless, but allegedly CRIS needs it */
-
-struct rb_root {
-	struct rb_node *rb_node;
-};
-
 #define rb_parent(r)   ((struct rb_node *)((r)->__rb_parent_color & ~3))
 
 #define RB_ROOT	(struct rb_root) { NULL, }
@@ -112,21 +102,6 @@ static inline void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent
 			typeof(*pos), field); 1; }); \
 	     pos = n)
 
-/*
- * Leftmost-cached rbtrees.
- *
- * We do not cache the rightmost node based on footprint
- * size vs number of potential users that could benefit
- * from O(1) rb_last(). Just not worth it, users that want
- * this feature can always implement the logic explicitly.
- * Furthermore, users that want to cache both pointers may
- * find it a bit asymmetric, but that's ok.
- */
-struct rb_root_cached {
-	struct rb_root rb_root;
-	struct rb_node *rb_leftmost;
-};
-
 #define RB_ROOT_CACHED (struct rb_root_cached) { {NULL, }, NULL }
 
 /* Same as rb_first(), but O(1) */
diff --git a/include/linux/rbtree_type.h b/include/linux/rbtree_type.h
new file mode 100644
index 000000000000..77a89dd2c7c6
--- /dev/null
+++ b/include/linux/rbtree_type.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _LINUX_RBTREE_TYPE_H
+#define _LINUX_RBTREE_TYPE_H
+
+struct rb_node {
+	unsigned long  __rb_parent_color;
+	struct rb_node *rb_right;
+	struct rb_node *rb_left;
+} __attribute__((aligned(sizeof(long))));
+/* The alignment might seem pointless, but allegedly CRIS needs it */
+
+struct rb_root {
+	struct rb_node *rb_node;
+};
+
+/*
+ * Leftmost-cached rbtrees.
+ *
+ * We do not cache the rightmost node based on footprint
+ * size vs number of potential users that could benefit
+ * from O(1) rb_last(). Just not worth it, users that want
+ * this feature can always implement the logic explicitly.
+ * Furthermore, users that want to cache both pointers may
+ * find it a bit asymmetric, but that's ok.
+ */
+struct rb_root_cached {
+	struct rb_root rb_root;
+	struct rb_node *rb_leftmost;
+};
+
+#endif
diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index add1dab27df5..b828b938c876 100644
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -14,7 +14,7 @@
 #define __LINUX_RT_MUTEX_H
 
 #include <linux/linkage.h>
-#include <linux/rbtree.h>
+#include <linux/rbtree_type.h>
 #include <linux/spinlock_types_raw.h>
 
 extern int max_lock_depth; /* for sysctl */
-- 
2.49.0

