linux-kernel - [PATCH/RFCv4 1/6] lib: rbtree: rb_root

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Date:	Fri, 20 Aug 2010 11:50:41 +0200
From:	Michal Nazarewicz <m.nazarewicz@...sung.com>
To:	linux-mm@...ck.org
Cc:	Daniel Walker <dwalker@...eaurora.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hans Verkuil <hverkuil@...all.nl>,
	Jonathan Corbet <corbet@....net>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Pawel Osciak <p.osciak@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Zach Pfeffer <zpfeffer@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: [PATCH/RFCv4 1/6] lib: rbtree: rb_root_init() function added

Added a rb_root_init() function which initialises a rb_root
structure as a red-black tree with at most one element.  The
rationale is that using rb_root_init(root, node) is more
straightforward and cleaner then first initialising and
empty tree followed by an insert operation.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 include/linux/rbtree.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 7066acb..5b6dc66 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -130,6 +130,17 @@ static inline void rb_set_color(struct rb_node *rb, int color)
 }
 
 #define RB_ROOT	(struct rb_root) { NULL, }
+
+static inline void rb_root_init(struct rb_root *root, struct rb_node *node)
+{
+	root->rb_node = node;
+	if (node) {
+		node->rb_parent_color = RB_BLACK; /* black, no parent */
+		node->rb_left  = NULL;
+		node->rb_right = NULL;
+	}
+}
+
 #define	rb_entry(ptr, type, member) container_of(ptr, type, member)
 
 #define RB_EMPTY_ROOT(root)	((root)->rb_node == NULL)
-- 
1.7.1


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