linux-kernel - [PATCH v2 04/11] net ipset: use rbtree postorder iteration instead of opencoding

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Message-Id: <1383788572-25938-5-git-send-email-cody@linux.vnet.ibm.com>
Date:	Wed,  6 Nov 2013 17:42:33 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	EXT4 <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>,
	rostedt@...dmis.org, "David S. Miller" <davem@...emloft.net>,
	Florian Westphal <fw@...len.de>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	coreteam@...filter.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>
Subject: [PATCH v2 04/11] net ipset: use rbtree postorder iteration instead of opencoding

Use rbtree_postorder_for_each_entry_safe() to destroy the rbtree instead
of opencoding an alternate postorder iteration that modifies the tree

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 net/netfilter/ipset/ip_set_hash_netiface.c | 27 ++++-----------------------
 1 file changed, 4 insertions(+), 23 deletions(-)

diff --git a/net/netfilter/ipset/ip_set_hash_netiface.c b/net/netfilter/ipset/ip_set_hash_netiface.c
index 7d798d5..99dba4c 100644
--- a/net/netfilter/ipset/ip_set_hash_netiface.c
+++ b/net/netfilter/ipset/ip_set_hash_netiface.c
@@ -45,31 +45,12 @@ struct iface_node {
 static void
 rbtree_destroy(struct rb_root *root)
 {
-	struct rb_node *p, *n = root->rb_node;
-	struct iface_node *node;
-
-	/* Non-recursive destroy, like in ext3 */
-	while (n) {
-		if (n->rb_left) {
-			n = n->rb_left;
-			continue;
-		}
-		if (n->rb_right) {
-			n = n->rb_right;
-			continue;
-		}
-		p = rb_parent(n);
-		node = rb_entry(n, struct iface_node, node);
-		if (!p)
-			*root = RB_ROOT;
-		else if (p->rb_left == n)
-			p->rb_left = NULL;
-		else if (p->rb_right == n)
-			p->rb_right = NULL;
+	struct iface_node *node, *next;
 
+	rbtree_postorder_for_each_entry_safe(node, next, root, node)
 		kfree(node);
-		n = p;
-	}
+
+	*root = RB_ROOT;
 }
 
 static int
-- 
1.8.4.2

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