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-rw-r--r--mm/page_alloc.c50
1 files changed, 28 insertions, 22 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 353ce9039a86..59164313167f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -156,10 +156,8 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
static int page_is_consistent(struct zone *zone, struct page *page)
{
-#ifdef CONFIG_HOLES_IN_ZONE
- if (!pfn_valid(page_to_pfn(page)))
+ if (!pfn_valid_within(page_to_pfn(page)))
return 0;
-#endif
if (zone != page_zone(page))
return 0;
@@ -227,7 +225,7 @@ static void bad_page(struct page *page)
static void free_compound_page(struct page *page)
{
- __free_pages_ok(page, (unsigned long)page[1].lru.prev);
+ __free_pages_ok(page, compound_order(page));
}
static void prep_compound_page(struct page *page, unsigned long order)
@@ -236,12 +234,13 @@ static void prep_compound_page(struct page *page, unsigned long order)
int nr_pages = 1 << order;
set_compound_page_dtor(page, free_compound_page);
- page[1].lru.prev = (void *)order;
- for (i = 0; i < nr_pages; i++) {
+ set_compound_order(page, order);
+ __SetPageHead(page);
+ for (i = 1; i < nr_pages; i++) {
struct page *p = page + i;
- __SetPageCompound(p);
- set_page_private(p, (unsigned long)page);
+ __SetPageTail(p);
+ p->first_page = page;
}
}
@@ -250,16 +249,19 @@ static void destroy_compound_page(struct page *page, unsigned long order)
int i;
int nr_pages = 1 << order;
- if (unlikely((unsigned long)page[1].lru.prev != order))
+ if (unlikely(compound_order(page) != order))
bad_page(page);
- for (i = 0; i < nr_pages; i++) {
+ if (unlikely(!PageHead(page)))
+ bad_page(page);
+ __ClearPageHead(page);
+ for (i = 1; i < nr_pages; i++) {
struct page *p = page + i;
- if (unlikely(!PageCompound(p) |
- (page_private(p) != (unsigned long)page)))
+ if (unlikely(!PageTail(p) |
+ (p->first_page != page)))
bad_page(page);
- __ClearPageCompound(p);
+ __ClearPageTail(p);
}
}
@@ -346,10 +348,8 @@ __find_combined_index(unsigned long page_idx, unsigned int order)
static inline int page_is_buddy(struct page *page, struct page *buddy,
int order)
{
-#ifdef CONFIG_HOLES_IN_ZONE
- if (!pfn_valid(page_to_pfn(buddy)))
+ if (!pfn_valid_within(page_to_pfn(buddy)))
return 0;
-#endif
if (page_zone_id(page) != page_zone_id(buddy))
return 0;
@@ -433,13 +433,18 @@ static inline int free_pages_check(struct page *page)
1 << PG_private |
1 << PG_locked |
1 << PG_active |
- 1 << PG_reclaim |
1 << PG_slab |
1 << PG_swapcache |
1 << PG_writeback |
1 << PG_reserved |
1 << PG_buddy ))))
bad_page(page);
+ /*
+ * PageReclaim == PageTail. It is only an error
+ * for PageReclaim to be set if PageCompound is clear.
+ */
+ if (unlikely(!PageCompound(page) && PageReclaim(page)))
+ bad_page(page);
if (PageDirty(page))
__ClearPageDirty(page);
/*
@@ -665,7 +670,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
}
#if MAX_NUMNODES > 1
-int nr_node_ids __read_mostly;
+int nr_node_ids __read_mostly = MAX_NUMNODES;
EXPORT_SYMBOL(nr_node_ids);
/*
@@ -770,8 +775,8 @@ void mark_free_pages(struct zone *zone)
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
- if (!PageNosave(page))
- ClearPageNosaveFree(page);
+ if (!swsusp_page_is_forbidden(page))
+ swsusp_unset_page_free(page);
}
for (order = MAX_ORDER - 1; order >= 0; --order)
@@ -780,7 +785,7 @@ void mark_free_pages(struct zone *zone)
pfn = page_to_pfn(list_entry(curr, struct page, lru));
for (i = 0; i < (1UL << order); i++)
- SetPageNosaveFree(pfn_to_page(pfn + i));
+ swsusp_set_page_free(pfn_to_page(pfn + i));
}
spin_unlock_irqrestore(&zone->lock, flags);
@@ -3203,7 +3208,8 @@ int min_free_kbytes_sysctl_handler(ctl_table *table, int write,
struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
{
proc_dointvec(table, write, file, buffer, length, ppos);
- setup_per_zone_pages_min();
+ if (write)
+ setup_per_zone_pages_min();
return 0;
}