linux-kernel - [PATCH 1/3] fs/proc/task_nommu.c: change maps_open() to use __seq_open

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Date:	Mon, 11 Aug 2014 19:00:30 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Ungerer <gerg@...inux.org>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	David Howells <dhowells@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] 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.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 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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