linux-kernel - Re: [PATCH] reset: meson: make it possible to build as a module

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Date:   Wed, 14 Oct 2020 09:43:02 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Robin Murphy <robin.murphy@....com>, p.zabel@...gutronix.de
Cc:     linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] reset: meson: make it possible to build as a module

On 13/10/2020 16:57, Robin Murphy wrote:
> On 2020-10-13 14:39, Neil Armstrong wrote:
>> In order to reduce the kernel Image size on multi-platform distributions,
>> make it possible to build the reset controller driver as a module.
>>
>> This partially reverts 8290924e ("reset: meson: make it explicitly non-modular")
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>   drivers/reset/Kconfig       | 4 ++--
>>   drivers/reset/reset-meson.c | 7 ++++++-
>>   2 files changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
>> index d9efbfd29646..ab315617565f 100644
>> --- a/drivers/reset/Kconfig
>> +++ b/drivers/reset/Kconfig
>> @@ -94,8 +94,8 @@ config RESET_LPC18XX
>>         This enables the reset controller driver for NXP LPC18xx/43xx SoCs.
>>     config RESET_MESON
>> -    bool "Meson Reset Driver" if COMPILE_TEST
>> -    default ARCH_MESON
>> +    tristate "Meson Reset Driver"
>> +    default ARCH_MESON || COMPILE_TEST
> 
> How about an actual dependency like:
> 
>     depends on ARCH_MESON || COMPILE_TEST
>     default ARCH_MESON
> ?
> 
> That way the option won't be presented to users where it's completely irrelevant, e.g. running "make oldconfig" with an x86 distro config. It always bugs me when I rebase a branch and have to manually confirm that indeed I don't want to build random drivers specific to x86/RISC-V/etc. SoCs for my arm64 config... ;)

You're right, thanks for pointing me this.

Neil

> 
> Robin.
> 
>>       help
>>         This enables the reset driver for Amlogic Meson SoCs.
>>   diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
>> index 94d7ba88d7d2..434d5c0f877e 100644
>> --- a/drivers/reset/reset-meson.c
>> +++ b/drivers/reset/reset-meson.c
>> @@ -9,6 +9,7 @@
>>   #include <linux/init.h>
>>   #include <linux/io.h>
>>   #include <linux/of.h>
>> +#include <linux/module.h>
>>   #include <linux/platform_device.h>
>>   #include <linux/reset-controller.h>
>>   #include <linux/slab.h>
>> @@ -142,4 +143,8 @@ static struct platform_driver meson_reset_driver = {
>>           .of_match_table    = meson_reset_dt_ids,
>>       },
>>   };
>> -builtin_platform_driver(meson_reset_driver);
>> +module_platform_driver(meson_reset_driver);
>> +
>> +MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
>> +MODULE_AUTHOR("Neil Armstrong <narmstrong@...libre.com>");
>> +MODULE_LICENSE("Dual BSD/GPL");
>>