linux-kernel - Re: [PATCH] media: rc: Drop obsolete dependencies on COMPILE

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Date:   Sun, 11 Dec 2022 21:56:48 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Jean Delvare <jdelvare@...e.de>
Cc:     Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pwm@...r.kernel.org
Subject: Re: [PATCH] media: rc: Drop obsolete dependencies on COMPILE_TEST

On Mon, Nov 21, 2022 at 05:09:11PM +0100, Jean Delvare wrote:
> Since commit 0166dc11be91 ("of: make CONFIG_OF user selectable"), it
> is possible to test-build any driver which depends on OF on any
> architecture by explicitly selecting OF. Therefore depending on
> COMPILE_TEST as an alternative is no longer needed.
> 
> It is actually better to always build such drivers with OF enabled,
> so that the test builds are closer to how each driver will actually be
> built on its intended target. Building them without OF may not test
> much as the compiler will optimize out potentially large parts of the
> code. In the worst case, this could even pop false positive warnings.
> Dropping COMPILE_TEST here improves the quality of our testing and
> avoids wasting time on non-existent issues.
> 
> As a minor optimization, this also lets us drop of_match_ptr(), as we
> now know what it will resolve to, we might as well save cpp some work.
> 
> Signed-off-by: Jean Delvare <jdelvare@...e.de>
> Cc: Sean Young <sean@...s.org>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de>
> ---
>  drivers/media/rc/Kconfig     |    4 ++--
>  drivers/media/rc/pwm-ir-tx.c |    2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> --- linux-6.0.orig/drivers/media/rc/Kconfig
> +++ linux-6.0/drivers/media/rc/Kconfig
> @@ -314,7 +314,7 @@ config IR_PWM_TX
>  	tristate "PWM IR transmitter"
>  	depends on LIRC
>  	depends on PWM
> -	depends on OF || COMPILE_TEST
> +	depends on OF
>  	help
>  	   Say Y if you want to use a PWM based IR transmitter. This is
>  	   more power efficient than the bit banging gpio driver.
> @@ -361,7 +361,7 @@ config IR_SERIAL_TRANSMITTER
>  config IR_SPI
>  	tristate "SPI connected IR LED"
>  	depends on SPI && LIRC
> -	depends on OF || COMPILE_TEST
> +	depends on OF
>  	help
>  	  Say Y if you want to use an IR LED connected through SPI bus.
>  
> --- linux-6.0.orig/drivers/media/rc/pwm-ir-tx.c
> +++ linux-6.0/drivers/media/rc/pwm-ir-tx.c
> @@ -120,7 +120,7 @@ static struct platform_driver pwm_ir_dri
>  	.probe = pwm_ir_probe,
>  	.driver = {
>  		.name	= DRIVER_NAME,
> -		.of_match_table = of_match_ptr(pwm_ir_of_match),
> +		.of_match_table = pwm_ir_of_match,
>  	},
>  };
>  module_platform_driver(pwm_ir_driver);

That hunk makes sense even without the Kconfig change. ACPI makes use of
.of_match_table, so

	.of_match_table = of_match_ptr(pwm_ir_of_match),

is (almost?) always wrong.

Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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