linux-kernel - Re: [PATCH 1/4] pid: Replace pid bitmap implementation with IDR API

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Date:   Mon, 25 Sep 2017 17:20:27 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Gargi Sharma <gs051095@...il.com>
Cc:     linux-kernel@...r.kernel.org, riel@...riel.com,
        julia.lawall@...6.fr, akpm@...ux-foundation.org, mingo@...nel.org,
        pasha.tatashin@...cle.com, ktkhai@...tuozzo.com
Subject: Re: [PATCH 1/4] pid: Replace pid bitmap implementation with IDR API

On 09/25, Gargi Sharma wrote:
>
> @@ -285,10 +145,14 @@ void free_pid(struct pid *pid)
>  			break;
>  		}
>  	}
> -	spin_unlock_irqrestore(&pidmap_lock, flags);
>  
> -	for (i = 0; i <= pid->level; i++)
> -		free_pidmap(pid->numbers + i);
> +	for (i = 0; i <= pid->level; i++) {
> +		struct upid *upid = pid->numbers + i;
> +		struct pid_namespace *ns = upid->ns;
> +
> +		idr_remove(&ns->idr, upid->nr);
> +	}
> +	spin_unlock_irqrestore(&pidmap_lock, flags);

Now that you moved the "free pidmap" code under pidmap_lock, we do not
need 2 "for (i = 0; i <= pid->level; i++)" loops, you could simply add
a single

	idr_remove(&ns->idr, upid->nr);

line into the 1st loop ?

Oleg.