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authorCody P Schafer <cody@linux.vnet.ibm.com>2013-02-22 16:35:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:20 -0800
commit108bcc96ef7047c02cad4d229f04da38186a3f3f (patch)
treee11d82074cae54dcf0fa8eea12750c661a16b02d /mm/page_alloc.c
parent9127ab4ff92f0ecd7b4671efa9d0edb21c691e9f (diff)
downloadlinux-108bcc96ef7047c02cad4d229f04da38186a3f3f.tar.gz
mm: add & use zone_end_pfn() and zone_spans_pfn()
Add 2 helpers (zone_end_pfn() and zone_spans_pfn()) to reduce code duplication. This also switches to using them in compaction (where an additional variable needed to be renamed), page_alloc, vmstat, memory_hotplug, and kmemleak. Note that in compaction.c I avoid calling zone_end_pfn() repeatedly because I expect at some point the sycronization issues with start_pfn & spanned_pages will need fixing, either by actually using the seqlock or clever memory barrier usage. Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Cc: David Hansen <dave@linux.vnet.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 64c83a8c322..a3687afc591 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -250,9 +250,7 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
do {
seq = zone_span_seqbegin(zone);
- if (pfn >= zone->zone_start_pfn + zone->spanned_pages)
- ret = 1;
- else if (pfn < zone->zone_start_pfn)
+ if (!zone_spans_pfn(zone, pfn))
ret = 1;
} while (zone_span_seqretry(zone, seq));
@@ -990,9 +988,9 @@ int move_freepages_block(struct zone *zone, struct page *page,
end_pfn = start_pfn + pageblock_nr_pages - 1;
/* Do not cross zone boundaries */
- if (start_pfn < zone->zone_start_pfn)
+ if (!zone_spans_pfn(zone, start_pfn))
start_page = page;
- if (end_pfn >= zone->zone_start_pfn + zone->spanned_pages)
+ if (!zone_spans_pfn(zone, end_pfn))
return 0;
return move_freepages(zone, start_page, end_page, migratetype);
@@ -1286,7 +1284,7 @@ void mark_free_pages(struct zone *zone)
spin_lock_irqsave(&zone->lock, flags);
- max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ max_zone_pfn = zone_end_pfn(zone);
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
@@ -3798,7 +3796,7 @@ static void setup_zone_migrate_reserve(struct zone *zone)
* the block.
*/
start_pfn = zone->zone_start_pfn;
- end_pfn = start_pfn + zone->spanned_pages;
+ end_pfn = zone_end_pfn(zone);
start_pfn = roundup(start_pfn, pageblock_nr_pages);
reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >>
pageblock_order;
@@ -3912,7 +3910,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
* pfn out of zone.
*/
if ((z->zone_start_pfn <= pfn)
- && (pfn < z->zone_start_pfn + z->spanned_pages)
+ && (pfn < zone_end_pfn(z))
&& !(pfn & (pageblock_nr_pages - 1)))
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
@@ -4713,7 +4711,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
* for the buddy allocator to function correctly.
*/
start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
- end = pgdat->node_start_pfn + pgdat->node_spanned_pages;
+ end = pgdat_end_pfn(pgdat);
end = ALIGN(end, MAX_ORDER_NR_PAGES);
size = (end - start) * sizeof(struct page);
map = alloc_remap(pgdat->node_id, size);
@@ -5928,8 +5926,7 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags,
pfn = page_to_pfn(page);
bitmap = get_pageblock_bitmap(zone, pfn);
bitidx = pfn_to_bitidx(zone, pfn);
- VM_BUG_ON(pfn < zone->zone_start_pfn);
- VM_BUG_ON(pfn >= zone->zone_start_pfn + zone->spanned_pages);
+ VM_BUG_ON(!zone_spans_pfn(zone, pfn));
for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
if (flags & value)
@@ -6027,8 +6024,7 @@ bool is_pageblock_removable_nolock(struct page *page)
zone = page_zone(page);
pfn = page_to_pfn(page);
- if (zone->zone_start_pfn > pfn ||
- zone->zone_start_pfn + zone->spanned_pages <= pfn)
+ if (!zone_spans_pfn(zone, pfn))
return false;
return !has_unmovable_pages(zone, page, 0, true);