linux-kernel - Re: [PATCH v3 4/4] mm: remove unneeded local variable in free_area_init

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Message-ID: <1bb89972-a942-e196-577c-aedb71aef8ee@redhat.com>
Date:   Tue, 5 Jan 2021 17:44:04 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, rppt@...nel.org
Subject: Re: [PATCH v3 4/4] mm: remove unneeded local variable in
 free_area_init_core

On 05.01.21 08:47, Baoquan He wrote:
> Local variable 'zone_start_pfn' is not needed since there's only
> one call site in free_area_init_core(). Let's remove it and pass
> zone->zone_start_pfn directly to init_currently_empty_zone().
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>  mm/page_alloc.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index e0ce6fb6373b..9cacb8652239 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6986,7 +6986,6 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
>  	for (j = 0; j < MAX_NR_ZONES; j++) {
>  		struct zone *zone = pgdat->node_zones + j;
>  		unsigned long size, freesize, memmap_pages;
> -		unsigned long zone_start_pfn = zone->zone_start_pfn;
>  
>  		size = zone->spanned_pages;
>  		freesize = zone->present_pages;
> @@ -7035,7 +7034,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
>  
>  		set_pageblock_order();
>  		setup_usemap(zone);
> -		init_currently_empty_zone(zone, zone_start_pfn, size);
> +		init_currently_empty_zone(zone, zone->zone_start_pfn, size);
>  		memmap_init_zone(zone);
>  	}
>  }
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb