linux-kernel - Re: [PATCH v3 3/5] bitmap: Add bitmap_alloc(), bitmap_zalloc() and bitmap

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Message-Id: <20180618141404.68124daab97bd0f3a3051544@linux-foundation.org>
Date:   Mon, 18 Jun 2018 14:14:04 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Shaohua Li <shli@...nel.org>, linux-raid@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org,
        Yury Norov <ynorov@...iumnetworks.com>,
        linux-kernel@...r.kernel.org, mika.westerberg@...ux.intel.com,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v3 3/5] bitmap: Add bitmap_alloc(), bitmap_zalloc() and
 bitmap_free()

On Mon, 18 Jun 2018 16:10:01 +0300 Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> A lot of code become ugly because of open coding allocations for bitmaps.
> 
> Introduce three helpers to allow users be more clear of intention
> and keep their code neat.
> 
> ...
>
> +unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
> +{
> +	return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long), flags);
> +}
> +EXPORT_SYMBOL(bitmap_alloc);
> +
> +unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags)
> +{
> +	return bitmap_alloc(nbits, flags | __GFP_ZERO);
> +}
> +EXPORT_SYMBOL(bitmap_zalloc);
> +
> +void bitmap_free(const unsigned long *bitmap)
> +{
> +	kfree(bitmap);
> +}
> +EXPORT_SYMBOL(bitmap_free);
> +

I suggest these functions are small and simple enough to justify
inlining them.