linux-kernel - Re: [PATCH 1/3] reset: imx7: Support module build

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Date:   Mon, 29 Jun 2020 12:41:41 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Stefan Agner <stefan.agner@...adex.com>,
        oleksandr.suvorov@...adex.com,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Leo Li <leoyang.li@....com>, Vinod Koul <vkoul@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Olof Johansson <olof@...om.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        NXP Linux Team <Linux-imx@....com>
Subject: Re: [PATCH 1/3] reset: imx7: Support module build

On Mon, Jun 29, 2020 at 12:25 PM Anson Huang <Anson.Huang@....com> wrote:
>
> Add module device table, module license to support module build.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/reset/Kconfig      | 4 ++--
>  drivers/reset/reset-imx7.c | 4 +++-
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index d9efbfd..033ab60 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -65,9 +65,9 @@ config RESET_HSDK
>           This enables the reset controller driver for HSDK board.
>
>  config RESET_IMX7
> -       bool "i.MX7/8 Reset Driver" if COMPILE_TEST
> +       tristate "i.MX7/8 Reset Driver"
>         depends on HAS_IOMEM
> -       default SOC_IMX7D || (ARM64 && ARCH_MXC)
> +       depends on SOC_IMX7D || (ARM64 && ARCH_MXC) || COMPILE_TEST
>         select MFD_SYSCON

You are dropping the 'default' line, so the driver is now disabled
in a defconfig build, which is not mentioned in the patch description.

Maybe make it 'default m'?

config RESET_IMX7
       tristate "i.MX7/8 Reset Driver"
       depends on HAS_IOMEM
       depends on SOC_IMX7D || (ARM64 && ARCH_MXC) || COMPILE_TEST
       default m if (SOC_IMX7D || (ARM64 && ARCH_MXC))
       select MFD_SYSCON

> @@ -395,3 +396,4 @@ static struct platform_driver imx7_reset_driver = {
>         },
>  };
>  builtin_platform_driver(imx7_reset_driver);
> +MODULE_LICENSE("GPL v2");

Generally speaking: when you add a MODULE_LICENSE tag, please also
add MODULE_AUTHOR and MODULE_DESCRIPTION.

The 'builtin_platform_driver()' should work correctly but prevent unloading the
module. Ideally please changed to 'module_platform_driver()' and add a
.remove function for the platform_driver.


       Arnd