Re: [PATCH 3/6] proc: remove mm_for_maps()

From: Hugh Dickins <hughd@google.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Oleg Nesterov <oleg@redhat.com>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Vasiliy Kulikov <segoon@openwall.com>,
	David Rientjes <rientjes@google.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Stephen Wilson <wilsons@start.ca>,
	Siddhesh Poyarekar <siddhesh.poyarekar@gmail.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: Re: [PATCH 3/6] proc: remove mm_for_maps()
Date: Wed, 11 Apr 2012 17:38:50 -0700 (PDT)	[thread overview]
Message-ID: <alpine.LSU.2.00.1204111737300.26607@eggly.anvils> (raw)
In-Reply-To: <1334123976-11681-3-git-send-email-xiyou.wangcong@gmail.com>

On Wed, 11 Apr 2012, Cong Wang wrote:

> mm_for_maps() is a simple wrapper for mm_access(),
> and the name is misleading, so just remove it and use
> mm_access() directly.
> 
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Alexey Dobriyan <adobriyan@gmail.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Yes, this is an improvement in my eyes.

Acked-by: Hugh Dickins <hughd@google.com>

> ---
>  fs/proc/base.c       |    7 +------
>  fs/proc/internal.h   |    2 --
>  fs/proc/task_mmu.c   |    4 ++--
>  fs/proc/task_nommu.c |    2 +-
>  4 files changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 919d14c..8608a4d 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -198,11 +198,6 @@ static int proc_root_link(struct dentry *dentry, struct path *path)
>  	return result;
>  }
>  
> -struct mm_struct *mm_for_maps(struct task_struct *task)
> -{
> -	return mm_access(task, PTRACE_MODE_READ);
> -}
> -
>  static int proc_pid_cmdline(struct task_struct *task, char * buffer)
>  {
>  	int res = 0;
> @@ -242,7 +237,7 @@ out:
>  
>  static int proc_pid_auxv(struct task_struct *task, char *buffer)
>  {
> -	struct mm_struct *mm = mm_for_maps(task);
> +	struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ);
>  	int res = PTR_ERR(mm);
>  	if (mm && !IS_ERR(mm)) {
>  		unsigned int nwords = 0;
> diff --git a/fs/proc/internal.h b/fs/proc/internal.h
> index 5f79bb8..a306437 100644
> --- a/fs/proc/internal.h
> +++ b/fs/proc/internal.h
> @@ -31,8 +31,6 @@ struct vmalloc_info {
>  	unsigned long	largest_chunk;
>  };
>  
> -extern struct mm_struct *mm_for_maps(struct task_struct *);
> -
>  #ifdef CONFIG_MMU
>  #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
>  extern void get_vmalloc_info(struct vmalloc_info *vmi);
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 2b9a760..03360a1 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -125,7 +125,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
>  	if (!priv->task)
>  		return ERR_PTR(-ESRCH);
>  
> -	mm = mm_for_maps(priv->task);
> +	mm = mm_access(priv->task, PTRACE_MODE_READ);
>  	if (!mm || IS_ERR(mm))
>  		return mm;
>  	down_read(&mm->mmap_sem);
> @@ -914,7 +914,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
>  	if (!pm.buffer)
>  		goto out_task;
>  
> -	mm = mm_for_maps(task);
> +	mm = mm_access(task, PTRACE_MODE_READ);
>  	ret = PTR_ERR(mm);
>  	if (!mm || IS_ERR(mm))
>  		goto out_free;
> diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
> index 74fe164..1ccfa53 100644
> --- a/fs/proc/task_nommu.c
> +++ b/fs/proc/task_nommu.c
> @@ -223,7 +223,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
>  	if (!priv->task)
>  		return ERR_PTR(-ESRCH);
>  
> -	mm = mm_for_maps(priv->task);
> +	mm = mm_access(priv->task, PTRACE_MODE_READ);
>  	if (!mm || IS_ERR(mm)) {
>  		put_task_struct(priv->task);
>  		priv->task = NULL;
> -- 
> 1.7.7.6
> 
> 