1 files changed, 25 insertions, 25 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e5483347291c..406a3c28c026 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1322,7 +1322,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf)
 	 * We can only reuse the page if nobody else maps the huge page or it's
 	 * part.
 	 */
-	if (reuse_swap_page(page, NULL)) {
+	if (reuse_swap_page(page)) {
 		pmd_t entry;
 		entry = pmd_mkyoung(orig_pmd);
 		entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
@@ -2542,38 +2542,28 @@ int total_mapcount(struct page *page)
  * need full accuracy to avoid breaking page pinning, because
  * page_trans_huge_mapcount() is slower than page_mapcount().
  */
-int page_trans_huge_mapcount(struct page *page, int *total_mapcount)
+int page_trans_huge_mapcount(struct page *page)
 {
-	int i, ret, _total_mapcount, mapcount;
+	int i, ret;
 
 	/* hugetlbfs shouldn't call it */
 	VM_BUG_ON_PAGE(PageHuge(page), page);
 
-	if (likely(!PageTransCompound(page))) {
-		mapcount = atomic_read(&page->_mapcount) + 1;
-		if (total_mapcount)
-			*total_mapcount = mapcount;
-		return mapcount;
-	}
+	if (likely(!PageTransCompound(page)))
+		return atomic_read(&page->_mapcount) + 1;
 
 	page = compound_head(page);
 
-	_total_mapcount = ret = 0;
+	ret = 0;
 	for (i = 0; i < thp_nr_pages(page); i++) {
-		mapcount = atomic_read(&page[i]._mapcount) + 1;
+		int mapcount = atomic_read(&page[i]._mapcount) + 1;
 		ret = max(ret, mapcount);
-		_total_mapcount += mapcount;
 	}
-	if (PageDoubleMap(page)) {
+
+	if (PageDoubleMap(page))
 		ret -= 1;
-		_total_mapcount -= thp_nr_pages(page);
-	}
-	mapcount = compound_mapcount(page);
-	ret += mapcount;
-	_total_mapcount += mapcount;
-	if (total_mapcount)
-		*total_mapcount = _total_mapcount;
-	return ret;
+
+	return ret + compound_mapcount(page);
 }
 
 /* Racy check whether the huge page can be split */
@@ -2614,6 +2604,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 {
 	struct page *head = compound_head(page);
 	struct deferred_split *ds_queue = get_deferred_split_queue(head);
+	XA_STATE(xas, &head->mapping->i_pages, head->index);
 	struct anon_vma *anon_vma = NULL;
 	struct address_space *mapping = NULL;
 	int extra_pins, ret;
@@ -2652,6 +2643,13 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 			goto out;
 		}
 
+		xas_split_alloc(&xas, head, compound_order(head),
+				mapping_gfp_mask(mapping) & GFP_RECLAIM_MASK);
+		if (xas_error(&xas)) {
+			ret = xas_error(&xas);
+			goto out;
+		}
+
 		anon_vma = NULL;
 		i_mmap_lock_read(mapping);
 
@@ -2681,13 +2679,12 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 	/* block interrupt reentry in xa_lock and spinlock */
 	local_irq_disable();
 	if (mapping) {
-		XA_STATE(xas, &mapping->i_pages, page_index(head));
-
 		/*
 		 * Check if the head page is present in page cache.
 		 * We assume all tail are present too, if head is there.
 		 */
-		xa_lock(&mapping->i_pages);
+		xas_lock(&xas);
+		xas_reset(&xas);
 		if (xas_load(&xas) != head)
 			goto fail;
 	}
@@ -2703,6 +2700,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 		if (mapping) {
 			int nr = thp_nr_pages(head);
 
+			xas_split(&xas, head, thp_order(head));
 			if (PageSwapBacked(head)) {
 				__mod_lruvec_page_state(head, NR_SHMEM_THPS,
 							-nr);
@@ -2719,7 +2717,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 		spin_unlock(&ds_queue->split_queue_lock);
 fail:
 		if (mapping)
-			xa_unlock(&mapping->i_pages);
+			xas_unlock(&xas);
 		local_irq_enable();
 		remap_page(head, thp_nr_pages(head));
 		ret = -EBUSY;
@@ -2733,6 +2731,8 @@ out_unlock:
 	if (mapping)
 		i_mmap_unlock_read(mapping);
 out:
+	/* Free any memory we didn't use */
+	xas_nomem(&xas, 0);
 	count_vm_event(!ret ? THP_SPLIT_PAGE : THP_SPLIT_PAGE_FAILED);
 	return ret;
 }