From 7438d60b4beddf83bdf7b27e2da7c2685f392b4e Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Tue, 30 Dec 2008 21:52:18 +0000
Subject: [PATCH] Avoid an unnecessary memory dereference in
 vm_map_entry_splay().

---
 sys/vm/vm_map.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
index bc78ec2d7fd..055be3b1c7f 100644
--- a/sys/vm/vm_map.c
+++ b/sys/vm/vm_map.c
@@ -737,9 +737,9 @@ vm_map_entry_splay(vm_offset_t addr, vm_map_entry_t root)
 				rlist = root;
 				root = y;
 			}
-		} else {
+		} else if (addr >= root->end) {
 			y = root->right;
-			if (addr < root->end || y == NULL)
+			if (y == NULL)
 				break;
 			if (addr >= y->end && y->right != NULL) {
 				/* Rotate left and put y on llist. */
@@ -755,7 +755,8 @@ vm_map_entry_splay(vm_offset_t addr, vm_map_entry_t root)
 				llist = root;
 				root = y;
 			}
-		}
+		} else
+			break;
 	}
 
 	/*