linux-kernel - Re: [PATCH v2 1/1] sched: watchdog: Touch kernel watchdog with sched count

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Message-ID: <20201021111156.GX2651@hirez.programming.kicks-ass.net>
Date:   Wed, 21 Oct 2020 13:11:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Xi Wang <xii@...gle.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Don <joshdon@...gle.com>, linux-kernel@...r.kernel.org,
        Paul Turner <pjt@...gle.com>,
        Paul McKenney <paulmck@...nel.org>
Subject: Re: [PATCH v2 1/1] sched: watchdog: Touch kernel watchdog with sched
 count

On Wed, Oct 21, 2020 at 12:24:20PM +0200, Peter Zijlstra wrote:
> +void resched_current_from_IRQ(void)
> +{
> +	struct pt_regs *regs = get_irq_regs();
> +
> +	WARN_ON_ONCE(!in_irq());
> +	WARN_ON_ONCE(user_mode(regs) || IS_ENABLED(CONFIG_PREEMPTION));

! that, obviously :/

> +
> +	set_tsk_need_resched(tsk);
> +	set_preempt_need_resched();
> +}