linux-kernel - Re: [PATCH v2] sh: sq: Use the bitmap API when applicable

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Date:   Fri, 21 Apr 2023 09:30:08 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-sh@...r.kernel.org
Subject: Re: [PATCH v2] sh: sq: Use the bitmap API when applicable

On Thu, 2023-04-20 at 21:19 +0200, Christophe JAILLET wrote:
> Using the bitmap API is less verbose than hand writing it.
> It also improves the semantic.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> v2:
>    - synch with latest linux-next because of 80f746e2bd0e which fixes a bug
> ---
>  arch/sh/kernel/cpu/sh4/sq.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/sh/kernel/cpu/sh4/sq.c b/arch/sh/kernel/cpu/sh4/sq.c
> index 27f2e3da5aa2..d289e99dc118 100644
> --- a/arch/sh/kernel/cpu/sh4/sq.c
> +++ b/arch/sh/kernel/cpu/sh4/sq.c
> @@ -372,7 +372,6 @@ static struct subsys_interface sq_interface = {
>  static int __init sq_api_init(void)
>  {
>  	unsigned int nr_pages = 0x04000000 >> PAGE_SHIFT;
> -	unsigned int size = (nr_pages + (BITS_PER_LONG - 1)) / BITS_PER_LONG;
>  	int ret = -ENOMEM;
>  
>  	printk(KERN_NOTICE "sq: Registering store queue API.\n");
> @@ -382,7 +381,7 @@ static int __init sq_api_init(void)
>  	if (unlikely(!sq_cache))
>  		return ret;
>  
> -	sq_bitmap = kcalloc(size, sizeof(long), GFP_KERNEL);
> +	sq_bitmap = bitmap_zalloc(nr_pages, GFP_KERNEL);
>  	if (unlikely(!sq_bitmap))
>  		goto out;
>  
> @@ -393,7 +392,7 @@ static int __init sq_api_init(void)
>  	return 0;
>  
>  out:
> -	kfree(sq_bitmap);
> +	bitmap_free(sq_bitmap);
>  	kmem_cache_destroy(sq_cache);
>  
>  	return ret;
> @@ -402,7 +401,7 @@ static int __init sq_api_init(void)
>  static void __exit sq_api_exit(void)
>  {
>  	subsys_interface_unregister(&sq_interface);
> -	kfree(sq_bitmap);
> +	bitmap_free(sq_bitmap);
>  	kmem_cache_destroy(sq_cache);
>  }
>  

Reviewed-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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