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

Signed-off-by: Oleg Nesterov <[email protected]>
---
 fs/proc/task_nommu.c |   22 +++++++---------------
 1 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 678455d..c12eab3 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -268,21 +268,13 @@ static const struct seq_operations proc_tid_maps_ops = {
 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;
+       struct proc_maps_private *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)
-- 
1.5.5.1

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