linux-kernel - Re: [PATCH v2 07/12] lib: bitmap: provide devm_bitmap_alloc() and devm_bitmap

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Date:   Thu, 4 Mar 2021 15:01:23 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Joel Becker <jlbec@...lplan.org>, Christoph Hellwig <hch@....de>,
        Shuah Khan <shuah@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kent Gibson <warthog618@...il.com>,
        Jonathan Corbet <corbet@....net>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 07/12] lib: bitmap: provide devm_bitmap_alloc() and
 devm_bitmap_zalloc()

On Thu, Mar 04, 2021 at 11:24:47AM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Provide managed variants of bitmap_alloc() and bitmap_zalloc().

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
A few nit-picks below.

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  include/linux/bitmap.h | 10 ++++++++++
>  lib/bitmap.c           | 33 +++++++++++++++++++++++++++++++++
>  2 files changed, 43 insertions(+)
> 
> diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
> index 3282db97e06c..e41c622db1b8 100644
> --- a/include/linux/bitmap.h
> +++ b/include/linux/bitmap.h
> @@ -9,6 +9,8 @@
>  #include <linux/string.h>
>  #include <linux/types.h>
>  
> +struct device;
> +
>  /*
>   * bitmaps provide bit arrays that consume one or more unsigned
>   * longs.  The bitmap interface and available operations are listed
> @@ -122,6 +124,14 @@ unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags);
>  unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags);
>  void bitmap_free(const unsigned long *bitmap);

> +/*
> + * Managed variants of the above.
> + */

One line?

> +unsigned long *devm_bitmap_alloc(struct device *dev,
> +				 unsigned int nbits, gfp_t flags);
> +unsigned long *devm_bitmap_zalloc(struct device *dev,
> +				  unsigned int nbits, gfp_t flags);

Both can be oneliners.

>  /*
>   * lib/bitmap.c provides these functions:
>   */
> diff --git a/lib/bitmap.c b/lib/bitmap.c
> index 78f70d9007ad..b4fd7fd084c6 100644
> --- a/lib/bitmap.c
> +++ b/lib/bitmap.c
> @@ -8,6 +8,7 @@
>  #include <linux/bitops.h>
>  #include <linux/bug.h>
>  #include <linux/ctype.h>
> +#include <linux/device.h>
>  #include <linux/errno.h>
>  #include <linux/export.h>
>  #include <linux/kernel.h>
> @@ -1263,6 +1264,38 @@ void bitmap_free(const unsigned long *bitmap)
>  }
>  EXPORT_SYMBOL(bitmap_free);
>  
> +static void devm_bitmap_free(void *data)
> +{
> +	unsigned long *bitmap = data;
> +
> +	bitmap_free(bitmap);
> +}

> +unsigned long *devm_bitmap_alloc(struct device *dev,
> +				 unsigned int nbits, gfp_t flags)

One line?

> +{
> +	unsigned long *bitmap;
> +	int ret;
> +
> +	bitmap = bitmap_alloc(nbits, flags);
> +	if (!bitmap)
> +		return NULL;
> +
> +	ret = devm_add_action_or_reset(dev, devm_bitmap_free, bitmap);
> +	if (ret)
> +		return NULL;
> +
> +	return bitmap;
> +}
> +EXPORT_SYMBOL(devm_bitmap_alloc);

> +unsigned long *devm_bitmap_zalloc(struct device *dev,
> +				  unsigned int nbits, gfp_t flags)

One line?

> +{
> +	return devm_bitmap_alloc(dev, nbits, flags | __GFP_ZERO);
> +}
> +EXPORT_SYMBOL(devm_bitmap_zalloc);
> +
>  #if BITS_PER_LONG == 64
>  /**
>   * bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap
> -- 
> 2.29.1
> 

-- 
With Best Regards,
Andy Shevchenko