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Date: Wed, 3 Apr 2024 12:30:44 +0300
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Arnd Bergmann <arnd@kernel.org>
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Subject: Re: [PATCH 33/34] drivers: remove incorrect of_match_ptr/ACPI_PTR
 annotations
Message-ID: <Zg0hxMZGlwfXV2RA@smile.fi.intel.com>
References: <20240403080702.3509288-1-arnd@kernel.org>
 <20240403080702.3509288-34-arnd@kernel.org>
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On Wed, Apr 03, 2024 at 10:06:51AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> When building with CONFIG_OF and/or CONFIG_ACPI disabled but W=1 extra
> warnings enabled, a lot of driver cause a warning about an unused
> ID table:
> 
> drivers/char/tpm/tpm_ftpm_tee.c:356:34: error: unused variable 'of_ftpm_tee_ids' [-Werror,-Wunused-const-variable]
> drivers/dma/img-mdc-dma.c:863:34: error: unused variable 'mdc_dma_of_match' [-Werror,-Wunused-const-variable]
> drivers/fpga/versal-fpga.c:62:34: error: unused variable 'versal_fpga_of_match' [-Werror,-Wunused-const-variable]
> drivers/i2c/muxes/i2c-mux-ltc4306.c:200:34: error: unused variable 'ltc4306_of_match' [-Werror,-Wunused-const-variable]
> drivers/i2c/muxes/i2c-mux-reg.c:242:34: error: unused variable 'i2c_mux_reg_of_match' [-Werror,-Wunused-const-variable]
> drivers/memory/pl353-smc.c:62:34: error: unused variable 'pl353_smc_supported_children' [-Werror,-Wunused-const-variable]
> drivers/regulator/pbias-regulator.c:136:34: error: unused variable 'pbias_of_match' [-Werror,-Wunused-const-variable]
> drivers/regulator/twl-regulator.c:552:34: error: unused variable 'twl_of_match' [-Werror,-Wunused-const-variable]
> drivers/regulator/twl6030-regulator.c:645:34: error: unused variable 'twl_of_match' [-Werror,-Wunused-const-variable]
> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c:3635:36: error: unused variable 'sas_v2_acpi_match' [-Werror,-Wunused-const-variable]
> drivers/staging/pi433/pi433_if.c:1359:34: error: unused variable 'pi433_dt_ids' [-Werror,-Wunused-const-variable]
> drivers/tty/serial/amba-pl011.c:2945:34: error: unused variable 'sbsa_uart_of_match' [-Werror,-Wunused-const-variable]
> 
> The fix is always to just remove the of_match_ptr() and ACPI_PTR() wrappers
> that remove the reference, rather than adding another #ifdef just for build
> testing for a configuration that doesn't matter in practice.

> I considered splitting up the large patch into per subsystem patches, but since
> it's really just the same thing everywhere it feels better to do it all at once.

Can we split to three groups:
- Dropping ACPI_PTR()
- Dropping of_match_ptr() (which I won't review in depth, for example)
- Dropping both
?

..

> --- a/drivers/char/ipmi/ipmb_dev_int.c
> +++ b/drivers/char/ipmi/ipmb_dev_int.c
> @@ -364,7 +364,7 @@ MODULE_DEVICE_TABLE(acpi, acpi_ipmb_id);
>  static struct i2c_driver ipmb_driver = {
>  	.driver = {
>  		.name = "ipmb-dev",
> -		.acpi_match_table = ACPI_PTR(acpi_ipmb_id),
> +		.acpi_match_table = acpi_ipmb_id,
>  	},
>  	.probe = ipmb_probe,
>  	.remove = ipmb_remove,

acpi.h --> mod_devicetable.h.

..

> --- a/drivers/hid/hid-google-hammer.c
> +++ b/drivers/hid/hid-google-hammer.c
> @@ -275,21 +275,19 @@ static const struct acpi_device_id cbas_ec_acpi_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, cbas_ec_acpi_ids);
>  
> -#ifdef CONFIG_OF
>  static const struct of_device_id cbas_ec_of_match[] = {
>  	{ .compatible = "google,cros-cbas" },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(of, cbas_ec_of_match);
> -#endif
>  
>  static struct platform_driver cbas_ec_driver = {
>  	.probe = cbas_ec_probe,
>  	.remove = cbas_ec_remove,
>  	.driver = {
>  		.name = "cbas_ec",
> -		.acpi_match_table = ACPI_PTR(cbas_ec_acpi_ids),
> -		.of_match_table = of_match_ptr(cbas_ec_of_match),
> +		.acpi_match_table = cbas_ec_acpi_ids,
> +		.of_match_table = cbas_ec_of_match,
>  		.pm = &cbas_ec_pm_ops,
>  	},
>  };

Ditto, and likely of.h can be also dropped.

..

> --- a/drivers/input/touchscreen/wdt87xx_i2c.c
> +++ b/drivers/input/touchscreen/wdt87xx_i2c.c
> @@ -1166,7 +1166,7 @@ static struct i2c_driver wdt87xx_driver = {
>  		.name = WDT87XX_NAME,
>  		.dev_groups = wdt87xx_groups,
>  		.pm = pm_sleep_ptr(&wdt87xx_pm_ops),
> -		.acpi_match_table = ACPI_PTR(wdt87xx_acpi_id),
> +		.acpi_match_table = wdt87xx_acpi_id,
>  	},
>  };
>  module_i2c_driver(wdt87xx_driver);

Ditto.

..

> --- a/drivers/net/ethernet/apm/xgene-v2/main.c
> +++ b/drivers/net/ethernet/apm/xgene-v2/main.c
> @@ -731,7 +731,7 @@ MODULE_DEVICE_TABLE(acpi, xge_acpi_match);
>  static struct platform_driver xge_driver = {
>  	.driver = {
>  		   .name = "xgene-enet-v2",
> -		   .acpi_match_table = ACPI_PTR(xge_acpi_match),
> +		   .acpi_match_table = xge_acpi_match,
>  	},
>  	.probe = xge_probe,
>  	.remove_new = xge_remove,

Ditto. And remove forward declaration of the variable as well.

..

> --- a/drivers/rtc/rtc-fsl-ftm-alarm.c
> +++ b/drivers/rtc/rtc-fsl-ftm-alarm.c
> @@ -320,7 +320,7 @@ static struct platform_driver ftm_rtc_driver = {
>  	.driver		= {
>  		.name	= "ftm-alarm",
>  		.of_match_table = ftm_rtc_match,
> -		.acpi_match_table = ACPI_PTR(ftm_imx_acpi_ids),
> +		.acpi_match_table = ftm_imx_acpi_ids,
>  	},
>  };

Ditto.

..

>  	.driver = {
>  		.name =		"pi433",
>  		.owner =	THIS_MODULE,

Oh-oh.

> -		.of_match_table = of_match_ptr(pi433_dt_ids),
> +		.of_match_table = pi433_dt_ids,
>  	},

..

> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2948,7 +2948,7 @@ static const struct of_device_id sbsa_uart_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, sbsa_uart_of_match);
>  
> -static const struct acpi_device_id __maybe_unused sbsa_uart_acpi_match[] = {
> +static const struct acpi_device_id sbsa_uart_acpi_match[] = {
>  	{ "ARMH0011", 0 },
>  	{ "ARMHB000", 0 },
>  	{},
> @@ -2961,8 +2961,8 @@ static struct platform_driver arm_sbsa_uart_platform_driver = {
>  	.driver	= {
>  		.name	= "sbsa-uart",
>  		.pm	= &pl011_dev_pm_ops,
> -		.of_match_table = of_match_ptr(sbsa_uart_of_match),
> -		.acpi_match_table = ACPI_PTR(sbsa_uart_acpi_match),
> +		.of_match_table = sbsa_uart_of_match,
> +		.acpi_match_table = sbsa_uart_acpi_match,
>  		.suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_AMBA_PL011),
>  	},
>  };

Ditto.

..

As mentioned above, I haven't and won't look into of_match_ptr() cases, but you
got the idea.

For the above, if addressed as suggested,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

-- 
With Best Regards,
Andy Shevchenko