Re: [PATCH RESEND] sh: sq: Use the bitmap API when applicable

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hi Christophe!

On Sun, 2023-04-16 at 21:05 +0200, Christophe JAILLET wrote:
> Using the bitmap API is less verbose than hand writing them.
> It also improves the semantic.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> This is a resend of [1].
> 
> Now cross-compile tested with CONFIG_CPU_SUBTYPE_SH7770=y
> 
> [1]: https://lore.kernel.org/all/521788e22ad8f7a5058c154f068b061525321841.1656142814.git.christophe.jaillet@wanadoo.fr/
> ---
>  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 = kzalloc(size, 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);
>  }
>  

Thanks for resending this patch. I will try to review it next week
and also boot-test it on my SH7785LCR evaluation board.

I am not familiar with the bitmap API at the moment, so I might take
a little longer to review this patch.

Adrian

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