[PATCH] dup_mmap: update comment on new vma

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 876b31cd822d..a28d11e10877 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -250,8 +250,9 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
 
                 /*
                  * 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;