linux-kernel - Re: [PATCH v3 1/1] kthread: allocate kthread structure using kmalloc

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Message-ID: <20161027131027.GB1016@redhat.com>
Date:   Thu, 27 Oct 2016 15:10:28 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Roman Pen <roman.penyaev@...fitbricks.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] kthread: allocate kthread structure using
        kmalloc

On 10/26, Josh Poimboeuf wrote:
>
> On Wed, Oct 26, 2016 at 04:14:00PM +0200, Oleg Nesterov wrote:
> > +/*
> > + * TODO: kill it and use to_kthread(). But we still need the users
> > + * like kthread_stop() which has to sync with the exiting kthread.
> > + */
> >  static struct kthread *to_live_kthread(struct task_struct *k)
>
> Now that the kthread struct is no longer on the stack, are the
> try_get_task_stack() and its corresponding put_task_stack()'s still
> needed?

It seems you missed this part

	Of course, with this patch we are ready to remove
	put_task_stack() from kthread.c right now. The next change should kill
	to_live_kthread() altogether.

in the same email ;)

Oleg.