linux-kernel - Re: [PATCH v6] gpio/mpc8xxx: change irq handler from chained to normal

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Date:   Thu, 3 Oct 2019 12:19:42 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Hui Song <hui.song_1@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v6] gpio/mpc8xxx: change irq handler from chained to normal

On Fri, Sep 27, 2019 at 5:26 AM Hui Song <hui.song_1@....com> wrote:

> From: Song Hui <hui.song_1@....com>
>
> More than one gpio controllers can share one interrupt, change the
> driver to request shared irq.
>
> While this will work, it will mess up userspace accounting of the number
> of interrupts per second in tools such as vmstat.  The reason is that
> for every GPIO interrupt, /proc/interrupts records the count against GIC
> interrupt 68 or 69, as well as the GPIO itself.  So, for every GPIO
> interrupt, the total number of interrupts that the system has seen
> increments by two
>
> Signed-off-by: Laurentiu Tudor <Laurentiu.Tudor@....com>
> Signed-off-by: Alex Marginean <alexandru.marginean@....com>
> Signed-off-by: Song Hui <hui.song_1@....com>
> ---
>  Changes in v6:
>         - change request_irq to devm_request_irq and add commit message

There is some build error on the patch, can you look into it?

Yours,
Linus Walleij