fs/proc/task_nommu.c: change maps_open() to use __seq_open_private()

Cleanup and preparation. maps_open() can use __seq_open_private()
like proc_maps_open() does.

[akpm@linux-foundation.org: deuglify]
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>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 14 deletions

diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 678455d2d683..98c95d2833ea 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -269,20 +269,13 @@ static int maps_open(struct inode *inode, struct file *file,
                      const struct seq_operations *ops)
 {
         struct proc_maps_private *priv;
-        int ret = -ENOMEM;
-
-        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-        if (priv) {
-                priv->pid = proc_pid(inode);
-                ret = seq_open(file, ops);
-                if (!ret) {
-                        struct seq_file *m = file->private_data;
-                        m->private = priv;
-                } else {
-                        kfree(priv);
-                }
-        }
-        return ret;
+
+        priv = __seq_open_private(file, ops, sizeof(struct proc_maps_private));
+        if (!priv)
+                return -ENOMEM;
+
+        priv->pid = proc_pid(inode);
+        return 0;
 }
 
 static int pid_maps_open(struct inode *inode, struct file *file)