linux-kernel - Re: [PATCH 10/21] clocksource: Replace setup_irq() by request

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Date:   Fri, 27 Mar 2020 11:24:51 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        afzal mohammed <afzal.mohd.ma@...il.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Barry Song <baohua@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Kevin Hilman <khilman@...libre.com>,
        Tony Prisk <linux@...sktech.co.nz>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Enrico Weigelt <info@...ux.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES" 
        <linux-samsung-soc@...r.kernel.org>,
        "open list:ARM/Amlogic Meson SoC support" 
        <linux-amlogic@...ts.infradead.org>
Subject: Re: [PATCH 10/21] clocksource: Replace setup_irq() by request_irq()

On Wed, Mar 18, 2020 at 6:42 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:

> From: afzal mohammed <afzal.mohd.ma@...il.com>
>
> request_irq() is preferred over setup_irq(). The early boot setup_irq()
> invocations happen either via 'init_IRQ()' or '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().
>
> A build error that was reported by kbuild test robot <lkp@...el.com>
> in the previous version of the patch also has been fixed.
>
> [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
>
> Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> Link: https://lore.kernel.org/r/91961c77c1cf93d41523f5e1ac52043f32f97077.1582799709.git.afzal.mohd.ma@gmail.com

Acked-by: Linus Walleij <linus.walleij@...aro.org>

It is definitely the right thing to do, I cannot test it right now
but if desired I can test it on my targets later in the following
weeks.

Yours,
Linus Walleij