khugepaged: call shmem_get_folio()

shmem_getpage() is being removed, so call its replacement and find the
precise page ourselves.

Link: https://lkml.kernel.org/r/20220902194653.1739778-32-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/khugepaged.c

@@ -1647,13 +1647,16 @@ static int collapse_file(struct mm_struct *mm, struct file *file,
 			}
 
 			if (xa_is_value(page) || !PageUptodate(page)) {
+				struct folio *folio;
+
 				xas_unlock_irq(&xas);
 				/* swap in or instantiate fallocated page */
-				if (shmem_getpage(mapping->host, index, &page,
-						  SGP_NOALLOC)) {
+				if (shmem_get_folio(mapping->host, index,
+						&folio, SGP_NOALLOC)) {
 					result = SCAN_FAIL;
 					goto xa_unlocked;
 				}
+				page = folio_file_page(folio, index);
 			} else if (trylock_page(page)) {
 				get_page(page);
 				xas_unlock_irq(&xas);

mm/shmem.c

@@ -3158,7 +3158,7 @@ static const char *shmem_get_link(struct dentry *dentry,
 		folio = filemap_get_folio(inode->i_mapping, 0);
 		if (!folio)
 			return ERR_PTR(-ECHILD);
-		if (PageHWPoison(&folio->page) ||
+		if (PageHWPoison(folio_page(folio, 0)) ||
 		    !folio_test_uptodate(folio)) {
 			folio_put(folio);
 			return ERR_PTR(-ECHILD);
@@ -3169,7 +3169,7 @@ static const char *shmem_get_link(struct dentry *dentry,
 			return ERR_PTR(error);
 		if (!folio)
 			return ERR_PTR(-ECHILD);
-		if (PageHWPoison(&folio->page)) {
+		if (PageHWPoison(folio_page(folio, 0))) {
 			folio_unlock(folio);
 			folio_put(folio);
 			return ERR_PTR(-ECHILD);