linux-kernel - Re: [PATCH 16/18] clocksource: Replace setup_irq() by request

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Date:   Thu, 20 Feb 2020 15:48:30 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     afzal mohammed <afzal.mohd.ma@...il.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-rpi-kernel <linux-rpi-kernel@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        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>,
        Allison Randal <allison@...utok.net>,
        Enrico Weigelt <info@...ux.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>
Subject: Re: [PATCH 16/18] clocksource: Replace setup_irq() by request_irq()

On Wed, Feb 12, 2020 at 9:05 AM 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 wherever that has been found, it too has been replaced by free_irq().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>

This makes the kernel a better place.
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij