linux-kernel - Re: [PATCH] iio: adc/imx25-gcq: move incorrect do

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Message-ID: <56BF3397.1040006@kernel.org>
Date:	Sat, 13 Feb 2016 13:45:59 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>, Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Denis Carikli <denis@...rea.com>,
	Markus Pargmann <mpa@...gutronix.de>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc/imx25-gcq: move incorrect do_div

On 12/02/16 11:15, Arnd Bergmann wrote:
> The newly added driver uses do_div() to device a 32-bit number, which now
> provokes a warning:
> 
> drivers/iio/adc/fsl-imx25-gcq.c: In function 'mx25_gcq_setup_cfgs':
> include/asm-generic/div64.h:207:28: warning: comparison of distinct pointer types lacks a cast
>   (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
> 
> This replaces the do_div() call with a straight division operator.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 6df2e98c3ea5 ("iio: adc: Add imx25-gcq ADC driver")
Acked-by: Jonathan Cameron <jic23@...nel.org>

oops.
> ---
>  drivers/iio/adc/fsl-imx25-gcq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/fsl-imx25-gcq.c b/drivers/iio/adc/fsl-imx25-gcq.c
> index 2fd192735d5b..72b32c1ab257 100644
> --- a/drivers/iio/adc/fsl-imx25-gcq.c
> +++ b/drivers/iio/adc/fsl-imx25-gcq.c
> @@ -233,7 +233,7 @@ static int mx25_gcq_setup_cfgs(struct platform_device *pdev,
>  			priv->channel_vref_mv[reg] =
>  				regulator_get_voltage(priv->vref[refp]);
>  			/* Conversion from uV to mV */
> -			do_div(priv->channel_vref_mv[reg], 1000);
> +			priv->channel_vref_mv[reg] /= 1000;
>  			break;
>  		case MX25_ADC_REFP_INT:
>  			priv->channel_vref_mv[reg] = 2500;
>