linux-kernel - Re: [PATCH 02/18] ARM: replace setup_irq() by request

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Message-Id: <20200213002716.99258cfd73002fdd4bbd17d9@gmail.com>
Date:   Thu, 13 Feb 2020 00:27:16 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     afzal mohammed <afzal.mohd.ma@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Krzysztof Halasa <khalasa@...p.pl>,
        Russell King <linux@...linux.org.uk>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Kevin Hilman <khilman@...nel.org>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>, Enrico Weigelt <info@...ux.net>
Subject: Re: [PATCH 02/18] ARM: replace setup_irq() by request_irq()

Hi!

On Wed, 12 Feb 2020 13:32:43 +0530
afzal mohammed <afzal.mohd.ma@...il.com> wrote:

> request_irq() is preferred over setup_irq(). Existing callers of
> setup_irq() reached mostly via 'init_IRQ()' & 'time_init()', while
> memory allocators are ready by 'mm_init()'.
> 
> Per tglx[1], setup_irq() existed in olden days when allocators were not
> ready by the time early interrupts were initialized.
> 
> Hence replace setup_irq() by request_irq().
> 
> Seldom remove_irq() usage has been observed coupled with setup_irq(),
> wherever that has been found, it too has been replaced by free_irq().
> 
> [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
> 
> Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>

For the EP93xx part:
Tested-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Acked-by: Alexander Sverdlin <alexander.sverdlin@...il.com>

> diff --git a/arch/arm/mach-ep93xx/timer-ep93xx.c b/arch/arm/mach-ep93xx/timer-ep93xx.c
> index de998830f534..0335f3b93340 100644
> --- a/arch/arm/mach-ep93xx/timer-ep93xx.c
> +++ b/arch/arm/mach-ep93xx/timer-ep93xx.c
> @@ -117,13 +117,6 @@ static irqreturn_t ep93xx_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction ep93xx_timer_irq = {
> -	.name		= "ep93xx timer",
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.handler	= ep93xx_timer_interrupt,
> -	.dev_id		= &ep93xx_clockevent,
> -};
> -
>  void __init ep93xx_timer_init(void)
>  {
>  	/* Enable and register clocksource and sched_clock on timer 4 */
> @@ -136,7 +129,10 @@ void __init ep93xx_timer_init(void)
>  			     EP93XX_TIMER4_RATE);
>  
>  	/* Set up clockevent on timer 3 */
> -	setup_irq(IRQ_EP93XX_TIMER3, &ep93xx_timer_irq);
> +	if (request_irq(IRQ_EP93XX_TIMER3, ep93xx_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "ep93xx timer",
> +			&ep93xx_clockevent))
> +		pr_err("request_irq() on %s failed\n", "ep93xx timer");
>  	clockevents_config_and_register(&ep93xx_clockevent,
>  					EP93XX_TIMER123_RATE,
>  					1,

-- 
Alexander Sverdlin.