Merge tag 'folio-5.16b' of git://git.infradead.org/users/willy/pagecache

Pull folio fixes from Matthew Wilcox:
 "In the course of preparing the folio changes for iomap for next merge
  window, we discovered some problems that would be nice to address now:

   - Renaming multi-page folios to large folios.

     mapping_multi_page_folio_support() is just a little too long, so we
     settled on mapping_large_folio_support(). That meant renaming, eg
     folio_test_multi() to folio_test_large().

     Rename AS_THP_SUPPORT to match

   - I hadn't included folio wrappers for zero_user_segments(), etc.
     Also, multi-page^W^W large folio support is now independent of
     CONFIG_TRANSPARENT_HUGEPAGE, so machines with HIGHMEM always need
     to fall back to the out-of-line zero_user_segments().

     Remove FS_THP_SUPPORT to match

   - The build bots finally got round to telling me that I missed a
     couple of architectures when adding flush_dcache_folio(). Christoph
     suggested that we just add linux/cacheflush.h and not rely on
     asm-generic/cacheflush.h"

* tag 'folio-5.16b' of git://git.infradead.org/users/willy/pagecache:
  mm: Add functions to zero portions of a folio
  fs: Rename AS_THP_SUPPORT and mapping_thp_support
  fs: Remove FS_THP_SUPPORT
  mm: Remove folio_test_single
  mm: Rename folio_test_multi to folio_test_large
  Add linux/cacheflush.h

4 files changed, 4 insertions, 5 deletions

diff --git a/mm/highmem.c b/mm/highmem.c
index ca9fa8c92593..762679050c9a 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -359,7 +359,6 @@ void kunmap_high(struct page *page)
 }
 EXPORT_SYMBOL(kunmap_high);
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
 		unsigned start2, unsigned end2)
 {
@@ -416,7 +415,6 @@ void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
 	BUG_ON((start1 | start2 | end1 | end2) != 0);
 }
 EXPORT_SYMBOL(zero_user_segments);
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 #endif /* CONFIG_HIGHMEM */
 
 #ifdef CONFIG_KMAP_LOCAL
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 781605e92015..6863a834ed42 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5558,7 +5558,7 @@ static int mem_cgroup_move_account(struct page *page,
 
 	VM_BUG_ON(from == to);
 	VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
-	VM_BUG_ON(compound && !folio_test_multi(folio));
+	VM_BUG_ON(compound && !folio_test_large(folio));
 
 	/*
 	 * Prevent mem_cgroup_migrate() from looking at
diff --git a/mm/shmem.c b/mm/shmem.c
index dc038ce78700..18f93c2d68f1 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2303,6 +2303,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
 		INIT_LIST_HEAD(&info->swaplist);
 		simple_xattrs_init(&info->xattrs);
 		cache_no_acl(inode);
+		mapping_set_large_folios(inode->i_mapping);
 
 		switch (mode & S_IFMT) {
 		default:
@@ -3870,7 +3871,7 @@ static struct file_system_type shmem_fs_type = {
 	.parameters	= shmem_fs_parameters,
 #endif
 	.kill_sb	= kill_litter_super,
-	.fs_flags	= FS_USERNS_MOUNT | FS_THP_SUPPORT,
+	.fs_flags	= FS_USERNS_MOUNT,
 };
 
 int __init shmem_init(void)
diff --git a/mm/util.c b/mm/util.c
index e58151a61255..741ba32a43ac 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -670,7 +670,7 @@ bool folio_mapped(struct folio *folio)
 {
 	long i, nr;
 
-	if (folio_test_single(folio))
+	if (!folio_test_large(folio))
 		return atomic_read(&folio->_mapcount) >= 0;
 	if (atomic_read(folio_mapcount_ptr(folio)) >= 0)
 		return true;