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linux-sg2042
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[PATCH] remove zone_mem_map 

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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3
include/asm-alpha/mmzone.h
View File

@ -83,8 +83,7 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p, int n)
pte_t pte; \
unsigned long pfn; \
\
pfn = ((unsigned long)((page)-page_zone(page)->zone_mem_map)) << 32; \
pfn += page_zone(page)->zone_start_pfn << 32; \
pfn = page_to_pfn(page) << 32; \
pte_val(pte) = pfn | pgprot_val(pgprot); \
\
pte; \

10
include/asm-generic/memory_model.h
View File

@ -45,11 +45,11 @@ extern unsigned long page_to_pfn(struct page *page);
NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
})
#define page_to_pfn(pg) \
({ struct page *__pg = (pg); \
struct zone *__zone = page_zone(__pg); \
(unsigned long)(__pg - __zone->zone_mem_map) + \
__zone->zone_start_pfn; \
#define page_to_pfn(pg) \
({ struct page *__pg = (pg); \
struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \
(unsigned long)(__pg - __pgdat->node_mem_map) + \
__pgdat->node_start_pfn; \
})
#elif defined(CONFIG_SPARSEMEM)

1
include/linux/mmzone.h
View File

@ -225,7 +225,6 @@ struct zone {
* Discontig memory support fields.
*/
struct pglist_data *zone_pgdat;
struct page *zone_mem_map;
/* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */
unsigned long zone_start_pfn;

6
mm/page_alloc.c
View File

@ -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)