linux-kernel - Re: [PATCH] iio: buffer: re-introduce bitmap

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Date:   Tue, 17 Mar 2020 14:52:23 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Alexandru Ardelean <ardeleanalex@...il.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        jic23@...nel.org, lars@...afoo.de,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: Re: [PATCH] iio: buffer: re-introduce bitmap_zalloc() for trialmask

On Tue, Mar 17, 2020 at 02:36:21PM +0200, Alexandru Ardelean wrote:
> Commit 3862828a903d3 ("iio: buffer: Switch to bitmap_zalloc()") introduced
> bitmap_alloc(), but commit 20ea39ef9f2f9 ("iio: Fix scan mask selection")
> reverted it.
> 
> This change adds it back. The only difference is that it's adding
> bitmap_zalloc(). There might be some changes later that would require
> initializing it to zero. In any case, now it's already zero-ing the
> trialmask.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> ---
>  drivers/iio/industrialio-buffer.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index 4ada5592aa2b..5ff34ce8b6a2 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -316,8 +316,7 @@ static int iio_scan_mask_set(struct iio_dev *indio_dev,
>  	const unsigned long *mask;
>  	unsigned long *trialmask;
>  
> -	trialmask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
> -			    sizeof(*trialmask), GFP_KERNEL);
> +	trialmask = bitmap_zalloc(indio_dev->masklength, GFP_KERNEL);
>  	if (trialmask == NULL)
>  		return -ENOMEM;
>  	if (!indio_dev->masklength) {
> -- 
> 2.20.1
> 

-- 
With Best Regards,
Andy Shevchenko