[PATCH 01/10] sh: Remove use of PG_arch_1 on individual pages

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Since switching to the new page table range API, we do not set the
PG_arch_1 (aka dcache clean) flag on tail pages, only on the folio.
Test it on the folio.  Also use page_mapped() instead of page_mapcount()
as it is more efficient.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 arch/sh/mm/cache-sh4.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index 862046f26981..cea8f1693908 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -241,13 +241,14 @@ static void sh4_flush_cache_page(void *args)
 	if ((vma->vm_mm == current->active_mm))
 		vaddr = NULL;
 	else {
+		struct folio *folio = page_folio(page);
 		/*
 		 * Use kmap_coherent or kmap_atomic to do flushes for
 		 * another ASID than the current one.
 		 */
 		map_coherent = (current_cpu_data.dcache.n_aliases &&
-			test_bit(PG_dcache_clean, &page->flags) &&
-			page_mapcount(page));
+			test_bit(PG_dcache_clean, folio_flags(folio)) &&
+			page_mapped(page));
 		if (map_coherent)
 			vaddr = kmap_coherent(page, address);
 		else
-- 
2.43.0