patches/old/secretmem-remove-uses-of-struct-page.patch

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: secretmem: remove uses of struct page
Date: Fri, 13 Jun 2025 20:47:43 +0100

Use filemap_lock_folio() instead of find_lock_page() to retrieve
a folio from the page cache.

[lorenzo.stoakes@oracle.com: fix check of filemap_lock_folio() return value]
  Link: https://lkml.kernel.org/r/fdbca1d0-01a3-4653-85ed-cf257bb848be@lucifer.local
Link: https://lkml.kernel.org/r/20250613194744.3175157-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/secretmem.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- a/mm/secretmem.c~secretmem-remove-uses-of-struct-page
+++ a/mm/secretmem.c
@@ -54,7 +54,6 @@ static vm_fault_t secretmem_fault(struct
 	pgoff_t offset = vmf->pgoff;
 	gfp_t gfp = vmf->gfp_mask;
 	unsigned long addr;
-	struct page *page;
 	struct folio *folio;
 	vm_fault_t ret;
 	int err;
@@ -65,16 +64,15 @@ static vm_fault_t secretmem_fault(struct
 	filemap_invalidate_lock_shared(mapping);
 
 retry:
-	page = find_lock_page(mapping, offset);
-	if (!page) {
+	folio = filemap_lock_folio(mapping, offset);
+	if (IS_ERR(folio)) {
 		folio = folio_alloc(gfp | __GFP_ZERO, 0);
 		if (!folio) {
 			ret = VM_FAULT_OOM;
 			goto out;
 		}
 
-		page = &folio->page;
-		err = set_direct_map_invalid_noflush(page);
+		err = set_direct_map_invalid_noflush(folio_page(folio, 0));
 		if (err) {
 			folio_put(folio);
 			ret = vmf_error(err);
@@ -90,7 +88,7 @@ retry:
 			 * already happened when we marked the page invalid
 			 * which guarantees that this call won't fail
 			 */
-			set_direct_map_default_noflush(page);
+			set_direct_map_default_noflush(folio_page(folio, 0));
 			if (err == -EEXIST)
 				goto retry;
 
@@ -98,11 +96,11 @@ retry:
 			goto out;
 		}
 
-		addr = (unsigned long)page_address(page);
+		addr = (unsigned long)folio_address(folio);
 		flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
 	}
 
-	vmf->page = page;
+	vmf->page = folio_file_page(folio, vmf->pgoff);
 	ret = VM_FAULT_LOCKED;
 
 out:
@@ -154,7 +152,7 @@ static int secretmem_migrate_folio(struc
 
 static void secretmem_free_folio(struct folio *folio)
 {
-	set_direct_map_default_noflush(&folio->page);
+	set_direct_map_default_noflush(folio_page(folio, 0));
 	folio_zero_segment(folio, 0, folio_size(folio));
 }
 
_