[PATCH] lower VM_DONTCOPY total_vm

dup_mmap of a VM_DONTCOPY vma forgot to lower the child's total_vm.  (But
no way does this account for the recent report of total_vm seen too low.)

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, 1 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index cdef6cea8900..b65187f0c74e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -208,8 +208,10 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm)
                 struct file *file;
 
                 if (mpnt->vm_flags & VM_DONTCOPY) {
+                        long pages = vma_pages(mpnt);
+                        mm->total_vm -= pages;
                         __vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file,
-                                                        -vma_pages(mpnt));
+                                                                -pages);
                         continue;
                 }
                 charge = 0;