From 4db7d0ee198d417f4144c58048fcb173d90096ea Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 9 Oct 2014 15:25:21 -0700 Subject: [PATCH] fs/proc/task_mmu.c: unify/simplify do_maps_open() and numa_maps_open() do_maps_open() and numa_maps_open() are overcomplicated, they could use __seq_open_private(). Plus they do the same, just sizeof(*priv) Change them to use a new simple helper, proc_maps_open(ops, psize). This simplifies the code and allows us to do the next changes. Signed-off-by: Oleg Nesterov Acked-by: Kirill A. Shutemov Acked-by: Cyrill Gorcunov Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 44 ++++++++++++++++---------------------------- 1 file changed, 16 insertions(+), 28 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 289dfdc0ec09..4d716a09d500 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -231,23 +231,23 @@ static void m_stop(struct seq_file *m, void *v) put_task_struct(priv->task); } +static int proc_maps_open(struct inode *inode, struct file *file, + const struct seq_operations *ops, int psize) +{ + struct proc_maps_private *priv = __seq_open_private(file, ops, psize); + + if (!priv) + return -ENOMEM; + + priv->pid = proc_pid(inode); + return 0; +} + static int do_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; + return proc_maps_open(inode, file, ops, + sizeof(struct proc_maps_private)); } static void @@ -1526,20 +1526,8 @@ static const struct seq_operations proc_tid_numa_maps_op = { static int numa_maps_open(struct inode *inode, struct file *file, const struct seq_operations *ops) { - struct numa_maps_private *priv; - int ret = -ENOMEM; - priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (priv) { - priv->proc_maps.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; + return proc_maps_open(inode, file, ops, + sizeof(struct numa_maps_private)); } static int pid_numa_maps_open(struct inode *inode, struct file *file)