From c9205c9f3e03b7793ce9d041b0bfced3688dc17d Mon Sep 17 00:00:00 2001
From: green <green>
Date: Fri, 1 Apr 2005 15:00:52 +0000
Subject: [PATCH] b=6000 Do not search any VMAs in NULL mm. Fixes NFS exporting
 problems for HP.

---
 lustre/llite/llite_mmap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lustre/llite/llite_mmap.c b/lustre/llite/llite_mmap.c
index 41438d6..e4d6670 100644
--- a/lustre/llite/llite_mmap.c
+++ b/lustre/llite/llite_mmap.c
@@ -283,6 +283,10 @@ static struct vm_area_struct * our_vma(unsigned long addr, size_t count)
         struct vm_area_struct *vma, *ret = NULL;
         ENTRY;
 
+        /* No MM (e.g. NFS)? No vmas too. */
+        if (!mm)
+                RETURN(NULL);
+
         spin_lock(&mm->page_table_lock);
         for(vma = find_vma(mm, addr);
             vma != NULL && vma->vm_start < (addr + count); vma = vma->vm_next) {
-- 
1.8.3.1