linux-kernel - [RFC PATCH v2 02/25] rbtree: add rbtree_postorder_for_each_entry

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Date:	Thu, 11 Apr 2013 18:13:34 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Simon Jeons <simon.jeons@...il.com>
Subject: [RFC PATCH v2 02/25] rbtree: add rbtree_postorder_for_each_entry_safe() helper.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 include/linux/rbtree.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 2879e96..1b239ca 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -85,4 +85,12 @@ static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
 	*rb_link = node;
 }
 
+#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \
+	for (pos = rb_entry(rb_first_postorder(root), typeof(*pos), field),\
+	      n = rb_entry(rb_next_postorder(&pos->field), \
+		      typeof(*pos), field); \
+	     &pos->field; \
+	     pos = n, \
+	      n = rb_entry(rb_next_postorder(&pos->field), typeof(*pos), field))
+
 #endif	/* _LINUX_RBTREE_H */
-- 
1.8.2.1

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