mm: account the total_vm in the vm_stat_account()

vm_stat_account() accounts the shared_vm, stack_vm and reserved_vm now.
But we can also account for total_vm in the vm_stat_account() which makes
the code tidy.

Even for mprotect_fixup(), we can get the right result in the end.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 8efac1fe56bc..aaa8813c45d1 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -381,10 +381,8 @@ static 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,
-                                                                -pages);
+                                                        -vma_pages(mpnt));
                         continue;
                 }
                 charge = 0;