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

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Date:   Wed, 12 Feb 2020 13:40:44 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
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>,
        Alexander Sverdlin <alexander.sverdlin@...il.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()

On 12-02-20, 13:32, afzal mohammed 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 wherever that has been found, it too has been replaced by free_irq().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>
> ---
>  arch/arm/mach-spear/time.c               |  9 ++-------
>
> diff --git a/arch/arm/mach-spear/time.c b/arch/arm/mach-spear/time.c
> index 289e036c9c30..92b2850eeb4f 100644
> --- a/arch/arm/mach-spear/time.c
> +++ b/arch/arm/mach-spear/time.c
> @@ -181,12 +181,6 @@ static irqreturn_t spear_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction spear_timer_irq = {
> -	.name = "timer",
> -	.flags = IRQF_TIMER,
> -	.handler = spear_timer_interrupt
> -};
> -
>  static void __init spear_clockevent_init(int irq)
>  {
>  	u32 tick_rate;
> @@ -201,7 +195,8 @@ static void __init spear_clockevent_init(int irq)
>  
>  	clockevents_config_and_register(&clkevt, tick_rate, 3, 0xfff0);
>  
> -	setup_irq(irq, &spear_timer_irq);
> +	if (request_irq(irq, spear_timer_interrupt, IRQF_TIMER, "timer", NULL))
> +		pr_err("request_irq() on %s failed\n", "timer");
>  }

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh