linux-kernel - Re: [patch] proc: cleanup: remove unused assignments

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Date:	Sun, 7 Mar 2010 22:13:08 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Dan Carpenter <error27@...il.com>, akpm@...ux-foundation.org,
	Al Viro <viro@...iv.linux.org.uk>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	James Morris <jmorris@...ei.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	"Helight.Xu" <helight.xu@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch] proc: cleanup: remove unused assignments

Quoting Oleg Nesterov (oleg@...hat.com):
> On 03/06, Dan Carpenter wrote:
> >
> > I removed 3 unused assignments.  The first two get reset on the first
> > statement of their functions.  For "err" in root.c we don't return an
> > error and we don't use the variable again.
> 
> Looks like the obviously nice cleanup to me.

Yup.  Particularly the last one might confuse someone...

Acked-by: Serge Hallyn <serue@...ibm.com>

> > Signed-off-by: Dan Carpenter <error27@...il.com>
> >
> > diff --git a/fs/proc/base.c b/fs/proc/base.c
> > index a731084..875d636 100644
> > --- a/fs/proc/base.c
> > +++ b/fs/proc/base.c
> > @@ -2434,7 +2434,7 @@ static struct dentry *proc_base_instantiate(struct inode *dir,
> >  	const struct pid_entry *p = ptr;
> >  	struct inode *inode;
> >  	struct proc_inode *ei;
> > -	struct dentry *error = ERR_PTR(-EINVAL);
> > +	struct dentry *error;
> >
> >  	/* Allocate the inode */
> >  	error = ERR_PTR(-ENOMEM);
> > @@ -2784,7 +2784,7 @@ out:
> >
> >  struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
> >  {
> > -	struct dentry *result = ERR_PTR(-ENOENT);
> > +	struct dentry *result;
> >  	struct task_struct *task;
> >  	unsigned tgid;
> >  	struct pid_namespace *ns;
> > diff --git a/fs/proc/root.c b/fs/proc/root.c
> > index 757c069..4258384 100644
> > --- a/fs/proc/root.c
> > +++ b/fs/proc/root.c
> > @@ -110,7 +110,6 @@ void __init proc_root_init(void)
> >  	if (err)
> >  		return;
> >  	proc_mnt = kern_mount_data(&proc_fs_type, &init_pid_ns);
> > -	err = PTR_ERR(proc_mnt);
> >  	if (IS_ERR(proc_mnt)) {
> >  		unregister_filesystem(&proc_fs_type);
> >  		return;
--
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