fs/proc/task_mmu.c: update m->version in the main loop in m_start()

Change the main loop in m_start() to update m->version. Mostly for
consistency, but this can help to avoid the same loop if the very
1st ->show() fails due to seq_overflow().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c7228c2326d1..34d93a1cdeec 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -184,11 +184,14 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 
         m->version = 0;
         if (pos < mm->map_count) {
-                for (vma = mm->mmap; pos; pos--)
+                for (vma = mm->mmap; pos; pos--) {
+                        m->version = vma->vm_start;
                         vma = vma->vm_next;
+                }
                 return vma;
         }
 
+        /* we do not bother to update m->version in this case */
         if (pos == mm->map_count && priv->tail_vma)
                 return priv->tail_vma;