linux-kernel - [PATCH 2/5] rbtree: add rbtree_postorder_for_each_entry

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Message-Id: <1374873223-25557-3-git-send-email-cody@linux.vnet.ibm.com>
Date:	Fri, 26 Jul 2013 14:13:40 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 2/5] rbtree: add rbtree_postorder_for_each_entry_safe() helper

Because deletion (of the entire tree) is a relatively common use of the
rbtree_postorder iteration, and because doing it safely means fiddling
with temporary storage, provide a helper to simplify postorder rbtree
iteration.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 include/linux/rbtree.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 2879e96..64ab98b 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -85,4 +85,21 @@ static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
 	*rb_link = node;
 }
 
+/**
+ * rbtree_postorder_for_each_entry_safe - iterate over rb_root in post order of
+ * given type safe against removal of rb_node entry
+ *
+ * @pos:	the 'type *' to use as a loop cursor.
+ * @n:		another 'type *' to use as temporary storage
+ * @root:	'rb_root *' of the rbtree.
+ * @field:	the name of the rb_node field within 'type'.
+ */
+#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 */
-- 
1.8.3.4

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