X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=mm%2Fhuge_memory.c;h=07941a1540cbb0850bf63fdcedd077d8b09afac9;hb=e02b18cf8735cd5161d6dbdc65fb45035ee35ef9;hp=5e9ef0fc261e9747717f112a53bafd8f96df7393;hpb=ccb6a666d555652232e845352b9ff7217aca85cb;p=platform%2Fkernel%2Flinux-rpi.git

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5e9ef0f..07941a1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2426,6 +2426,8 @@ static void __split_huge_page(struct page *page, struct list_head *list,
 	/* lock lru list/PageCompound, ref frozen by page_ref_freeze */
 	lruvec = lock_page_lruvec(head);
 
+	ClearPageHasHWPoisoned(head);
+
 	for (i = nr - 1; i >= 1; i--) {
 		__split_huge_page_tail(head, i, lruvec, list);
 		/* Some pages can be beyond EOF: drop them from page cache */
@@ -2615,11 +2617,16 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 	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;
 
@@ -2700,12 +2707,14 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 		if (mapping) {
 			int nr = thp_nr_pages(head);
 
-			if (PageSwapBacked(head))
+			if (PageSwapBacked(head)) {
 				__mod_lruvec_page_state(head, NR_SHMEM_THPS,
 							-nr);
-			else
+			} else {
 				__mod_lruvec_page_state(head, NR_FILE_THPS,
 							-nr);
+				filemap_nr_thps_dec(mapping);
+			}
 		}
 
 		__split_huge_page(page, list, end);
@@ -2870,14 +2879,15 @@ static void split_huge_pages_all(void)
 	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))
@@ -2888,8 +2898,10 @@ static void split_huge_pages_all(void)
 
 			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);