linux-kernel - Re: [PATCH RESEND v2] mm/mm_init: use helper macro BITS_PER_LONG and BITS_PER

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Date:   Mon, 7 Aug 2023 08:31:23 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, david@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2] mm/mm_init: use helper macro BITS_PER_LONG and
 BITS_PER_BYTE

On Mon, Aug 07, 2023 at 10:35:28AM +0800, Miaohe Lin wrote:
> It's more readable to use helper macro BITS_PER_LONG and BITS_PER_BYTE.
> No functional change intended.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> Reviewed-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
> v2:
>   use BITS_PER_BYTE per Mike.
>   Collect Reviewed-by tag per David.
>   Thanks both.
> ---
>  mm/mm_init.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index 66aca3f6accd..93b1febd4a32 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -79,7 +79,7 @@ void __init mminit_verify_pageflags_layout(void)
>  	int shift, width;
>  	unsigned long or_mask, add_mask;
>  
> -	shift = 8 * sizeof(unsigned long);
> +	shift = BITS_PER_LONG;
>  	width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH
>  		- LAST_CPUPID_SHIFT - KASAN_TAG_WIDTH - LRU_GEN_WIDTH - LRU_REFS_WIDTH;
>  	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
> @@ -1431,9 +1431,9 @@ static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned l
>  	usemapsize = roundup(zonesize, pageblock_nr_pages);
>  	usemapsize = usemapsize >> pageblock_order;
>  	usemapsize *= NR_PAGEBLOCK_BITS;
> -	usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long));
> +	usemapsize = roundup(usemapsize, BITS_PER_LONG);
>  
> -	return usemapsize / 8;
> +	return usemapsize / BITS_PER_BYTE;
>  }
>  
>  static void __ref setup_usemap(struct zone *zone)
> -- 
> 2.33.0
> 

-- 
Sincerely yours,
Mike.