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

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Date:	Sat, 30 Mar 2013 09:17:51 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, david@...morbit.com,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] kthread: implement probe_kthread_data()

Hello, Oleg.

On Sat, Mar 30, 2013 at 7:36 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> > +void *probe_kthread_data(struct task_struct *task)
> > +{
> > +     struct kthread *kthread = to_kthread(task);
> > +     void *data = NULL;
> > +
> > +     probe_kernel_read(&data, &kthread->data, sizeof(data));
> > +     return data;
> > +}
>
> OK, but we can simply check ->vfork_done != NULL ?

Hmm... what if ->vfork_done is pointing to some weird place?

Thanks.

--
tejun
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