static void __split_huge_page_refcount(struct page *page)
{
int i;
- unsigned long head_index = page->index;
struct zone *zone = page_zone(page);
- int zonestat;
int tail_count = 0;
/* prevent PageLRU to go away from under us, and freeze lru stats */
/* complete memcg works before add pages to LRU */
mem_cgroup_split_huge_fixup(page);
- for (i = 1; i < HPAGE_PMD_NR; i++) {
+ for (i = HPAGE_PMD_NR - 1; i >= 1; i--) {
struct page *page_tail = page + i;
/* tail_page->_mapcount cannot change */
BUG_ON(page_tail->mapping);
page_tail->mapping = page->mapping;
- page_tail->index = ++head_index;
+ page_tail->index = page->index + i;
BUG_ON(!PageAnon(page_tail));
BUG_ON(!PageUptodate(page_tail));
__dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
__mod_zone_page_state(zone, NR_ANON_PAGES, HPAGE_PMD_NR);
- /*
- * A hugepage counts for HPAGE_PMD_NR pages on the LRU statistics,
- * so adjust those appropriately if this page is on the LRU.
- */
- if (PageLRU(page)) {
- zonestat = NR_LRU_BASE + page_lru(page);
- __mod_zone_page_state(zone, zonestat, -(HPAGE_PMD_NR-1));
- }
-
ClearPageCompound(page);
compound_unlock(page);
spin_unlock_irq(&zone->lru_lock);