linux-kernel - Re: [PATCH 1/3] kthread: implement probe_kthread

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Date:	Wed, 3 Apr 2013 11:26:59 +0200
From:	Jan Kara <jack@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, akpm@...ux-foundation.org, jack@...e.cz,
	david@...morbit.com, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH 1/3] kthread: implement probe_kthread_data()

On Fri 29-03-13 20:00:45, Tejun Heo wrote:
> Implement probe_kthread_data() which returns kthread_data if
> accessible.  The function is equivalent to kthread_data() except that
> the specified @task may not be a kthread or its vfork_done is already
> cleared rendering struct kthread inaccessible.  In the former case,
> probe_kthread_data() may return any value.  In the latter, NULL.
> 
> This will be used to safely print debug information without affecting
> synchronization in the normal paths.  Workqueue debug info printing on
> dump_stack() and friends will make use of it.
  Thanks for looking into this. Just one typo correction below:

> @@ -122,6 +123,24 @@ void *kthread_data(struct task_struct *task)
>  	return to_kthread(task)->data;
>  }
>  
> +/**
> + * probe_kthread_data - speculatively version of kthread_data()
                                   ^^^^ speculative

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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