mm: replace multiple dcache flush with flush_dcache_folio()

Simplify the code by using flush_dcache_folio().

Link: https://lkml.kernel.org/r/20220210123058.79206-8-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Fam Zheng <fam.zheng@bytedance.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Lars Persson <lars.persson@axis.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/migrate.c b/mm/migrate.c
index 996c0e3..54b168a 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -916,12 +916,8 @@ static int move_to_new_page(struct page *newpage, struct page *page,
                if (!PageMappingFlags(page))
                        page->mapping = NULL;
 
-               if (likely(!is_zone_device_page(newpage))) {
-                       int i, nr = compound_nr(newpage);
-
-                       for (i = 0; i < nr; i++)
-                               flush_dcache_page(newpage + i);
-               }
+               if (likely(!is_zone_device_page(newpage)))
+                       flush_dcache_folio(page_folio(newpage));
        }
 out:
        return rc;