From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 9 Oct 2014 22:25:39 +0000 (-0700)
Subject: fs/proc/task_mmu.c: introduce m_next_vma() helper
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ad2a00e4b7e20ab03700b0bb13270b6cee45c6e0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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 bb16c967eefd..fef398948462 100644
--- 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;