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

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Message-ID: <20170526173846.euu6dmmo6ghc3bky@treble>
Date:   Fri, 26 May 2017 12:38:46 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Miroslav Benes <mbenes@...e.cz>
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 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?

-- 
Josh