Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751442Ab0HTJv4 (ORCPT ); Fri, 20 Aug 2010 05:51:56 -0400 Received: from mailout1.w1.samsung.com ([210.118.77.11]:61686 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751346Ab0HTJvw (ORCPT ); Fri, 20 Aug 2010 05:51:52 -0400 Date: Fri, 20 Aug 2010 11:50:41 +0200 From: Michal Nazarewicz Subject: [PATCH/RFCv4 1/6] lib: rbtree: rb_root_init() function added In-reply-to: To: linux-mm@kvack.org Cc: Daniel Walker , FUJITA Tomonori , Hans Verkuil , Jonathan Corbet , Konrad Rzeszutek Wilk , Kyungmin Park , Marek Szyprowski , Mark Brown , Pawel Osciak , Russell King , Zach Pfeffer , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Message-id: <0b02e05fc21e70a3af39e65e628d117cd89d70a1.1282286941.git.m.nazarewicz@samsung.com> MIME-version: 1.0 X-Mailer: git-send-email 1.7.1 Content-type: TEXT/PLAIN Content-transfer-encoding: 7BIT References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1401 Lines: 43 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/