linux-kernel - Re: [PATCH 1/2] iio: buffer: Save a few cycles in 'iio_scan_mask

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Date:   Sat, 17 Jul 2021 17:58:32 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     lars@...afoo.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] iio: buffer: Save a few cycles in
 'iio_scan_mask_set()'

On Wed, 14 Jul 2021 13:14:41 +0200
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:

> Use 'bitmap_alloc()' instead of 'bitmap_zalloc()' because the bitmap
> is fully overridden by a 'bitmap_copy()' call just after its allocation.
> 
> While at it, fix the style of a NULL check.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Applied to the togreg branch of iio.git and pushed out as testing for the autobuilders
to poke at it.

Thanks,

Jonathan

> ---
>  drivers/iio/industrialio-buffer.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index fdd623407b96..6d4776a7f002 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -354,8 +354,8 @@ static int iio_scan_mask_set(struct iio_dev *indio_dev,
>  	const unsigned long *mask;
>  	unsigned long *trialmask;
>  
> -	trialmask = bitmap_zalloc(indio_dev->masklength, GFP_KERNEL);
> -	if (trialmask == NULL)
> +	trialmask = bitmap_alloc(indio_dev->masklength, GFP_KERNEL);
> +	if (!trialmask)
>  		return -ENOMEM;
>  	if (!indio_dev->masklength) {
>  		WARN(1, "Trying to set scanmask prior to registering buffer\n");