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 0A5476B0071 for ; Fri, 19 Nov 2010 10:58:26 -0500 (EST) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from eu_spt1 ([210.118.77.13]) by mailout3.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0LC50077B31CGQ20@mailout3.w1.samsung.com> for linux-mm@kvack.org; Fri, 19 Nov 2010 15:58:24 +0000 (GMT) Received: from linux.samsung.com ([106.116.38.10]) by spt1.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LC50012A31B14@spt1.w1.samsung.com> for linux-mm@kvack.org; Fri, 19 Nov 2010 15:58:24 +0000 (GMT) Date: Fri, 19 Nov 2010 16:57:59 +0100 From: Michal Nazarewicz Subject: [RFCv6 01/13] lib: rbtree: rb_root_init() function added In-reply-to: Message-id: References: Sender: owner-linux-mm@kvack.org To: mina86@mina86.com Cc: Andrew Morton , Ankita Garg , Bryan Huntsman , Daniel Walker , FUJITA Tomonori , Hans Verkuil , Johan Mossberg , Jonathan Corbet , KAMEZAWA Hiroyuki , Konrad Rzeszutek Wilk , Marcus LORENTZON , Marek Szyprowski , Mark Brown , Mel Gorman , Pawel Osciak , Russell King , Vaidyanathan Srinivasan , Zach Pfeffer , dipankar@in.ibm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.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) -- 1.7.2.3 -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org