From c6c6b49c67a1768e82859e4dd0efbeb5e0452d87 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sun, 22 Nov 2009 21:54:46 +0100
Subject: Do not fail if no PTE maps virtual address 0

        * i386/intel/pmap.c (pmap_unmap_page_zero): Do not fail if no PTE maps
        virtual address 0.
---
 i386/intel/pmap.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'i386')

diff --git a/i386/intel/pmap.c b/i386/intel/pmap.c
index bc3acfc..c633fd9 100644
--- a/i386/intel/pmap.c
+++ b/i386/intel/pmap.c
@@ -2410,6 +2410,8 @@ pmap_unmap_page_zero ()
   int *pte;
 
   pte = (int *) pmap_pte (kernel_pmap, 0);
+  if (!pte)
+    return;
   assert (pte);
   *pte = 0;
   INVALIDATE_TLB(kernel_pmap, 0, PAGE_SIZE);
-- 
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