fs/proc/task_mmu.c: introduce m_next_vma() helper

Extract the tail_vma/vm_next calculation from m_next() into the new
trivial helper, m_next_vma().

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>

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index bb16c96..fef3989 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -138,6 +138,14 @@ static void vma_stop(struct proc_maps_private *priv)
        mmput(mm);
 }
 
+static struct vm_area_struct *
+m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma)
+{
+       if (vma == priv->tail_vma)
+               return NULL;
+       return vma->vm_next ?: priv->tail_vma;
+}
+
 static void *m_start(struct seq_file *m, loff_t *ppos)
 {
        struct proc_maps_private *priv = m->private;
@@ -173,13 +181,10 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 {
        struct proc_maps_private *priv = m->private;
-       struct vm_area_struct *tail_vma = priv->tail_vma;
-       struct vm_area_struct *vma = v, *next = NULL;
+       struct vm_area_struct *next;
 
        (*pos)++;
-       if (vma != tail_vma)
-               next = vma->vm_next ?: tail_vma;
-
+       next = m_next_vma(priv, v);
        if (!next)
                vma_stop(priv);
        return next;