linux-kernel - Re: [PATCH] fix tasklist + find_pid() with CONFIG_PREEMPT

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Message-Id: <200912140215.nBE2FMRk085925@www262.sakura.ne.jp>
Date:	Mon, 14 Dec 2009 11:15:22 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix tasklist + find_pid() with CONFIG_PREEMPT_RCU

Hello.

Below change (found at http://lkml.org/lkml/2008/1/30/1 ) is not yet applied
as of 2.6.32-git10 . Any reason not to apply?

> diff --git a/include/linux/pid.h b/include/linux/pid.h
> index e29a900..0ffb8cc 100644
> --- a/include/linux/pid.h
> +++ b/include/linux/pid.h
> @@ -100,8 +100,7 @@ struct pid_namespace;
>  extern struct pid_namespace init_pid_ns;
> 
>  /*
> - * look up a PID in the hash table. Must be called with the tasklist_lock
> - * or rcu_read_lock() held.
> + * look up a PID in the hash table. Must be called with the rcu_read_lock() held.
>   *
>   * find_pid_ns() finds the pid in the namespace specified
>   * find_pid() find the pid by its global id, i.e. in the init namespace
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