From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id 425296B0047 for ; Mon, 6 Sep 2010 02:34:28 -0400 (EDT) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from eu_spt2 ([210.118.77.14]) by mailout4.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0L8B005NVBLDJ140@mailout4.w1.samsung.com> for linux-mm@kvack.org; Mon, 06 Sep 2010 07:34:25 +0100 (BST) Received: from linux.samsung.com ([106.116.38.10]) by spt2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0L8B00EKHBLD32@spt2.w1.samsung.com> for linux-mm@kvack.org; Mon, 06 Sep 2010 07:34:25 +0100 (BST) Date: Mon, 06 Sep 2010 08:33:51 +0200 From: Michal Nazarewicz Subject: [RFCv5 1/9] lib: rbtree: rb_root_init() function added In-reply-to: Message-id: <77e08b611d45c8b830d59a7d111105d3a597fc5c.1283749231.git.mina86@mina86.com> References: Sender: owner-linux-mm@kvack.org To: linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-mm@kvack.org Cc: Andrew Morton , Daniel Walker , FUJITA Tomonori , Hans Verkuil , Jonathan Corbet , KAMEZAWA Hiroyuki , Konrad Rzeszutek Wilk , Kyungmin Park , Marek Szyprowski , Mel Gorman , Minchan Kim , Pawel Osciak , Peter Zijlstra , Russell King , Zach Pfeffer , linux-kernel@vger.kernel.org List-ID: 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 Signed-off-by: Kyungmin Park --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org