linux-kernel - Re: [PATCH v2] leds: pm8058: Silence pointer to integer size warning

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Message-ID: <20171201075715.2bkjpjfqbitz2bem@dell>
Date:   Fri, 1 Dec 2017 07:57:15 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: [PATCH v2] leds: pm8058: Silence pointer to integer size warning

On Thu, 30 Nov 2017, Bjorn Andersson wrote:

> The pointer returned by of_device_get_match_data() doesn't have the same
> size as u32 on 64-bit architectures, causing a compile warning when
> compile-testing the driver on such platform.
> 
> Cast the return value of of_device_get_match_data() to unsigned long and
> then to u32 to silence this warning.
> 
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Fixes: 7f866986e705 ("leds: add PM8058 LEDs driver")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/leds/leds-pm8058.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-pm8058.c b/drivers/leds/leds-pm8058.c
> index a52674327857..8988ba3b2d65 100644
> --- a/drivers/leds/leds-pm8058.c
> +++ b/drivers/leds/leds-pm8058.c
> @@ -106,7 +106,7 @@ static int pm8058_led_probe(struct platform_device *pdev)
>  	if (!led)
>  		return -ENOMEM;
>  
> -	led->ledtype = (u32)of_device_get_match_data(&pdev->dev);
> +	led->ledtype = (u32)(unsigned long)of_device_get_match_data(&pdev->dev);

Wouldn't (u32)(void *) be even more correct?

... if the compiler will let you get away with it.

>  	map = dev_get_regmap(pdev->dev.parent, NULL);
>  	if (!map) {

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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