linux-kernel - Re: [PATCH v3] ARM: orion: replace setup_irq() by request

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Message-ID: <87sgicxa4s.fsf@FE-laptop>
Date:   Fri, 13 Mar 2020 21:39:15 +0100
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     afzal mohammed <afzal.mohd.ma@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     afzal mohammed <afzal.mohd.ma@...il.com>
Subject: Re: [PATCH v3] ARM: orion: replace setup_irq() by request_irq()

Hi afzal,

> request_irq() is preferred over setup_irq(). Invocations of setup_irq()
> occur after memory allocators are ready.
>
> 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().
>
> [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
>
> Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>

Applied on mvebu/arm

Thanks,

Gregory

> ---
> Hi sub-arch maintainers,
>
> If the patch is okay, please take it thr' your tree.
>
> Regards
> afzal
>
> v3:
>  * Split out from series, also split out from ARM patch to subarch level
> 	as Thomas suggested to take it thr' respective maintainers
>  * Modify string displayed in case of error as suggested by Thomas
>  * Re-arrange code as required to improve readability
>  * Remove irrelevant parts from commit message & improve
>  
> v2:
>  * Replace pr_err("request_irq() on %s failed" by
>            pr_err("%s: request_irq() failed"
>  * Commit message massage
>
>  arch/arm/plat-orion/time.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm/plat-orion/time.c b/arch/arm/plat-orion/time.c
> index ffb93db68e9c..509d4824dc1c 100644
> --- a/arch/arm/plat-orion/time.c
> +++ b/arch/arm/plat-orion/time.c
> @@ -177,12 +177,6 @@ static irqreturn_t orion_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction orion_timer_irq = {
> -	.name		= "orion_tick",
> -	.flags		= IRQF_TIMER,
> -	.handler	= orion_timer_interrupt
> -};
> -
>  void __init
>  orion_time_set_base(void __iomem *_timer_base)
>  {
> @@ -236,7 +230,9 @@ orion_time_init(void __iomem *_bridge_base, u32 _bridge_timer1_clr_mask,
>  	/*
>  	 * Setup clockevent timer (interrupt-driven).
>  	 */
> -	setup_irq(irq, &orion_timer_irq);
> +	if (request_irq(irq, orion_timer_interrupt, IRQF_TIMER, "orion_tick",
> +			NULL))
> +		pr_err("Failed to request irq %u (orion_tick)\n", irq);
>  	orion_clkevt.cpumask = cpumask_of(0);
>  	clockevents_config_and_register(&orion_clkevt, tclk, 1, 0xfffffffe);
>  }
> -- 
> 2.25.1
>

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com