linux-kernel - Re: [PATCH 3/3] livepatch: force transition process to finish

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Message-ID: <alpine.LSU.2.20.1705291126290.6176@pobox.suse.cz>
Date:   Mon, 29 May 2017 11:26:42 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     jeyu@...hat.com, jikos@...nel.org, pmladek@...e.com,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] livepatch: force transition process to finish

On Fri, 26 May 2017, Josh Poimboeuf wrote:

> On Thu, May 18, 2017 at 02:00:43PM +0200, Miroslav Benes wrote:
> > @@ -591,3 +591,19 @@ void klp_send_fake_signal(void)
> >  	}
> >  	read_unlock(&tasklist_lock);
> >  }
> > +
> > +/*
> > + * Drop TIF_PATCH_PENDING of all tasks on admin's request. This forces an
> > + * existing transition to finish.
> > + */
> > +void klp_unmark_tasks(void)
> > +{
> > +	struct task_struct *g, *task;
> > +
> > +	pr_warn("all tasks marked as migrated on admin's request\n");
> > +
> > +	read_lock(&tasklist_lock);
> > +	for_each_process_thread(g, task)
> > +		klp_update_patch_state(task);
> > +	read_unlock(&tasklist_lock);
> > +}
> 
> Should this also force the idle tasks to transition?

Yes. Thanks.

Miroslav