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[PATCH] remove zone_mem_map

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This patch removes zone_mem_map.

pfn_to_page uses pgdat, page_to_pfn uses zone.  page_to_pfn can use pgdat
instead of zone, which is only one user of zone_mem_map.  By modifing it,
we can remove zone_mem_map.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
KAMEZAWA Hiroyuki
2006-03-27 01:15:55 -08:00
committed by Linus Torvalds
parent 0ecd702bcb
commit a0140c1d85
4 changed files with 8 additions and 12 deletions
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6
mm/page_alloc.c
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@@ -2042,7 +2042,6 @@ static __meminit void init_currently_empty_zone(struct zone *zone,
zone_wait_table_init(zone, size);
pgdat->nr_zones = zone_idx(zone) + 1;
zone->zone_mem_map = pfn_to_page(zone_start_pfn);
zone->zone_start_pfn = zone_start_pfn;
memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn);
@@ -2768,9 +2767,8 @@ struct page *pfn_to_page(unsigned long pfn)
}
unsigned long page_to_pfn(struct page *page)
{
struct zone *zone = page_zone(page);
return (page - zone->zone_mem_map) + zone->zone_start_pfn;
struct pglist_data *pgdat = NODE_DATA(page_to_nid(page));
return (page - pgdat->node_mem_map) + pgdat->node_start_pfn;
}
#elif defined(CONFIG_SPARSEMEM)
struct page *pfn_to_page(unsigned long pfn)