linux-kernel - [PATCH 2/3] kvm: rb_int_search

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Date:	Sat, 24 Nov 2012 18:44:23 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Asias He <asias.hejun@...il.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] kvm: rb_int_search_single simplification

As the rbtree intervals are not overlapping, rb_int_search_single can
trivially be implemented without making use of the max_high field.

Signed-off-by: Michel Lespinasse <walken@...gle.com>

---
 tools/kvm/util/rbtree-interval.c |   18 +++++-------------
 1 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/tools/kvm/util/rbtree-interval.c b/tools/kvm/util/rbtree-interval.c
index fd69252bea02..740ff0d87536 100644
--- a/tools/kvm/util/rbtree-interval.c
+++ b/tools/kvm/util/rbtree-interval.c
@@ -5,27 +5,19 @@
 struct rb_int_node *rb_int_search_single(struct rb_root *root, u64 point)
 {
 	struct rb_node *node = root->rb_node;
-	struct rb_node *lowest = NULL;
 
 	while (node) {
 		struct rb_int_node *cur = rb_int(node);
 
-		if (node->rb_left && (rb_int(node->rb_left)->max_high > point)) {
+		if (point < cur->low)
 			node = node->rb_left;
-		} else if (cur->low <= point && cur->high > point) {
-			lowest = node;
-			break;
-		} else if (point > cur->low) {
+		else if (cur->high <= point)
 			node = node->rb_right;
-		} else {
-			break;
-		}
+		else
+			return cur;
 	}
 
-	if (lowest == NULL)
-		return NULL;
-
-	return rb_int(lowest);
+	return NULL;
 }
 
 struct rb_int_node *rb_int_search_range(struct rb_root *root, u64 low, u64 high)
-- 
1.7.7.3
--
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