linux-kernel - Re: [PATCH] pidns: remove the useless function is_container

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Date:	Mon, 19 Nov 2012 14:12:24 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	serge@...lyn.com, akpm@...ux-foundation.org
Subject: Re: [PATCH] pidns: remove the useless function is_container_init

Quoting Gao feng (gaofeng@...fujitsu.com):
> since commit 1cdcbec1a3372c0c49c59d292e708fd07b509f18,
> is_container_init has no used for a long time.
> 
> just remove it.

Only thing is it's being exported, so I think it needs to go through
deprecation.

> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> ---
>  include/linux/sched.h |    6 ------
>  kernel/pid.c          |   15 ---------------
>  2 files changed, 0 insertions(+), 21 deletions(-)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 0dd42a0..3fadd26 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1710,12 +1710,6 @@ static inline int is_global_init(struct task_struct *tsk)
>  	return tsk->pid == 1;
>  }
>  
> -/*
> - * is_container_init:
> - * check whether in the task is init in its own pid namespace.
> - */
> -extern int is_container_init(struct task_struct *tsk);
> -
>  extern struct pid *cad_pid;
>  
>  extern void free_task(struct task_struct *tsk);
> diff --git a/kernel/pid.c b/kernel/pid.c
> index aebd4f5..8ccdf0e 100644
> --- a/kernel/pid.c
> +++ b/kernel/pid.c
> @@ -81,21 +81,6 @@ struct pid_namespace init_pid_ns = {
>  };
>  EXPORT_SYMBOL_GPL(init_pid_ns);
>  
> -int is_container_init(struct task_struct *tsk)
> -{
> -	int ret = 0;
> -	struct pid *pid;
> -
> -	rcu_read_lock();
> -	pid = task_pid(tsk);
> -	if (pid != NULL && pid->numbers[pid->level].nr == 1)
> -		ret = 1;
> -	rcu_read_unlock();
> -
> -	return ret;
> -}
> -EXPORT_SYMBOL(is_container_init);
> -
>  /*
>   * Note: disable interrupts while the pidmap_lock is held as an
>   * interrupt might come in and do read_lock(&tasklist_lock).
> -- 
> 1.7.7.6
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