linux-kernel - Re: [RFC PATCH 05/10] genirq: Let purely flow-masked ONESHOT irqs through unmask_threaded

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Date:   Fri, 09 Apr 2021 15:52:48 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Subject: Re: [RFC PATCH 05/10] genirq: Let purely flow-masked ONESHOT irqs through unmask_threaded_irq()

On Thu, Apr 08 2021 at 16:43, Valentin Schneider wrote:
> A subsequent patch will let IRQs end up in irq_finalize_oneshot() without
> IRQD_IRQ_MASKED, but with IRQD_IRQ_FLOW_MASKED set instead. Let such IRQs
> receive their final ->irq_eoi().
>
> Signed-off-by: Valentin Schneider <valentin.schneider@....com>
> ---
>  kernel/irq/manage.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index e976c4927b25..59c8056d6714 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -1076,7 +1076,7 @@ static void irq_finalize_oneshot(struct irq_desc *desc,
>  	desc->threads_oneshot &= ~action->thread_mask;
>  
>  	if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
> -	    irqd_irq_masked(&desc->irq_data))
> +	    (irqd_irq_masked(&desc->irq_data) || irqd_irq_flow_masked(&desc->irq_data)))
>  		unmask_threaded_irq(desc);

This creates better code when you have '|' instead of '||' because the
compiler can spare a conditional and combine the bit check into one.

Thanks,

        tglx