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Subject: Re: [PATCH v5 3/5] mm: simplify parater of function
 memmap_init_zone()
To:     Baoquan He <bhe@redhat.com>, linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, akpm@linux-foundation.org, rppt@kernel.org,
        lkp@intel.com
References: <20210122135956.5946-1-bhe@redhat.com>
 <20210122135956.5946-4-bhe@redhat.com>
From:   David Hildenbrand <david@redhat.com>
Organization: Red Hat GmbH
Message-ID: <fd8d230b-c7f1-9bf5-2cee-528053b692d8@redhat.com>
Date:   Fri, 22 Jan 2021 16:39:23 +0100
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On 22.01.21 14:59, Baoquan He wrote:
> As David suggested, simply passing 'struct zone *zone' is enough. We can
> get all needed information from 'struct zone*' easily.
> 
> Suggested-by: David Hildenbrand <david@redhat.com>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> ---
>  arch/ia64/mm/init.c | 12 +++++++-----
>  include/linux/mm.h  |  3 +--
>  mm/page_alloc.c     | 24 +++++++++++-------------
>  3 files changed, 19 insertions(+), 20 deletions(-)
> 
> diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
> index c8e68e92beb3..88fb44895408 100644
> --- a/arch/ia64/mm/init.c
> +++ b/arch/ia64/mm/init.c
> @@ -541,12 +541,14 @@ virtual_memmap_init(u64 start, u64 end, void *arg)
>  	return 0;
>  }
>  
> -void __meminit
> -memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> -	     unsigned long start_pfn)
> +void __meminit memmap_init_zone(struct zone *zone)
>  {
> +	int nid = zone_to_nid(zone), zone_id = zone_idx(zone);
> +	unsigned long start_pfn = zone->zone_start_pfn;
> +	unsigned long size = zone->spanned_pages;
> +
>  	if (!vmem_map) {
> -		memmap_init_range(size, nid, zone, start_pfn, start_pfn + size,
> +		memmap_init_range(size, nid, zone_id, start_pfn, start_pfn + size,
>  				 MEMINIT_EARLY, NULL, MIGRATE_MOVABLE);
>  	} else {
>  		struct page *start;
> @@ -556,7 +558,7 @@ memmap_init_zone(unsigned long size, int nid, unsigned long zone,
>  		args.start = start;
>  		args.end = start + size;
>  		args.nid = nid;
> -		args.zone = zone;
> +		args.zone = zone_id;
>  
>  		efi_memmap_walk(virtual_memmap_init, &args);
>  	}
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 2395dc212221..073049bd0b29 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2401,8 +2401,7 @@ extern void set_dma_reserve(unsigned long new_dma_reserve);
>  extern void memmap_init_range(unsigned long, int, unsigned long,
>  		unsigned long, unsigned long, enum meminit_context,
>  		struct vmem_altmap *, int migratetype);
> -extern void memmap_init_zone(unsigned long size, int nid,
> -		unsigned long zone, unsigned long range_start_pfn);
> +extern void memmap_init_zone(struct zone *zone);
>  extern void setup_per_zone_wmarks(void);
>  extern int __meminit init_per_zone_wmark_min(void);
>  extern void mem_init(void);
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 42a1d2d2a87d..cbb67d9c1b2a 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6254,23 +6254,21 @@ static void __meminit zone_init_free_lists(struct zone *zone)
>  	}
>  }
>  
> -void __meminit __weak memmap_init_zone(unsigned long size, int nid,
> -				  unsigned long zone,
> -				  unsigned long range_start_pfn)
> +void __meminit __weak memmap_init_zone(struct zone *zone)
>  {
> +	unsigned long zone_start_pfn = zone->zone_start_pfn;
> +	unsigned long zone_end_pfn = zone_start_pfn + zone->spanned_pages;
> +	int i, nid = zone_to_nid(zone), zone_id = zone_idx(zone);
>  	unsigned long start_pfn, end_pfn;
> -	unsigned long range_end_pfn = range_start_pfn + size;
> -	int i;
>  
>  	for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
> -		start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
> -		end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
> +		start_pfn = clamp(start_pfn, zone_start_pfn, zone_end_pfn);
> +		end_pfn = clamp(end_pfn, zone_start_pfn, zone_end_pfn);
>  
> -		if (end_pfn > start_pfn) {
> -			size = end_pfn - start_pfn;
> -			memmap_init_range(size, nid, zone, start_pfn, range_end_pfn,
> -					 MEMINIT_EARLY, NULL, MIGRATE_MOVABLE);
> -		}
> +		if (end_pfn > start_pfn)
> +			memmap_init_range(end_pfn - start_pfn, nid,
> +					zone_id, start_pfn, zone_end_pfn,
> +					MEMINIT_EARLY, NULL, MIGRATE_MOVABLE);
>  	}
>  }
>  
> @@ -6978,7 +6976,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
>  		set_pageblock_order();
>  		setup_usemap(pgdat, zone, zone_start_pfn, size);
>  		init_currently_empty_zone(zone, zone_start_pfn, size);
> -		memmap_init_zone(size, nid, j, zone_start_pfn);
> +		memmap_init_zone(zone);
>  	}
>  }
>  
> 

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

-- 
Thanks,

David / dhildenb