struct address_space *mapping = NULL;
int extra_pins, ret;
pgoff_t end;
+ bool is_hzp;
- VM_BUG_ON_PAGE(is_huge_zero_page(head), head);
VM_BUG_ON_PAGE(!PageLocked(head), head);
VM_BUG_ON_PAGE(!PageCompound(head), head);
+ is_hzp = is_huge_zero_page(head);
+ VM_WARN_ON_ONCE_PAGE(is_hzp, head);
+ if (is_hzp)
+ return -EBUSY;
+
if (PageWriteback(head))
return -EBUSY;
unsigned long total = 0, split = 0;
pr_debug("Split all THPs\n");
- for_each_populated_zone(zone) {
+ for_each_zone(zone) {
+ if (!managed_zone(zone))
+ continue;
max_zone_pfn = zone_end_pfn(zone);
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
- if (!pfn_valid(pfn))
- continue;
+ int nr_pages;
- page = pfn_to_page(pfn);
- if (!get_page_unless_zero(page))
+ page = pfn_to_online_page(pfn);
+ if (!page || !get_page_unless_zero(page))
continue;
if (zone != page_zone(page))
total++;
lock_page(page);
+ nr_pages = thp_nr_pages(page);
if (!split_huge_page(page))
split++;
+ pfn += nr_pages - 1;
unlock_page(page);
next:
put_page(page);