[PATCH] dup_mmap: update comment on new vma

[PATCH] dup_mmap: update comment on new vma

[Hugh Dickins]

Remove part of comment on linking new vma in dup_mmap: since anon_vma
rmap came in, try_to_unmap_one knows the vma without needing find_vma.
But add a comment to note that here vma is inserted without mmap_sem.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
---

 kernel/fork.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

--- 2.6.12-rc6/kernel/fork.c	2005-05-25 18:09:19.000000000 +0100
+++ linux/kernel/fork.c	2005-06-04 20:41:55.000000000 +0100
@@ -249,8 +249,9 @@ static inline int dup_mmap(struct mm_str
 
 		/*
 		 * Link in the new vma and copy the page table entries:
-		 * link in first so that swapoff can see swap entries,
-		 * and try_to_unmap_one's find_vma find the new vma.
+		 * link in first so that swapoff can see swap entries.
+		 * Note that, exceptionally, here the vma is inserted
+		 * without holding mm->mmap_sem.
 		 */
 		spin_lock(&mm->page_table_lock);
 		*pprev = tmp;