1 files changed, 42 insertions, 0 deletions
diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c
new file mode 100644
index 000000000..a7bb20055
--- /dev/null
+++ b/arch/arm64/mm/copypage.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Based on arch/arm/mm/copypage.c
+ *
+ * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
+ * Copyright (C) 2012 ARM Ltd.
+ */
+
+#include <linux/bitops.h>
+#include <linux/mm.h>
+
+#include <asm/page.h>
+#include <asm/cacheflush.h>
+#include <asm/cpufeature.h>
+#include <asm/mte.h>
+
+void copy_highpage(struct page *to, struct page *from)
+{
+	void *kto = page_address(to);
+	void *kfrom = page_address(from);
+
+	copy_page(kto, kfrom);
+
+	if (kasan_hw_tags_enabled())
+		page_kasan_tag_reset(to);
+
+	if (system_supports_mte() && page_mte_tagged(from)) {
+		/* It's a new page, shouldn't have been tagged yet */
+		WARN_ON_ONCE(!try_page_mte_tagging(to));
+		mte_copy_page_tags(kto, kfrom);
+		set_page_mte_tagged(to);
+	}
+}
+EXPORT_SYMBOL(copy_highpage);
+
+void copy_user_highpage(struct page *to, struct page *from,
+			unsigned long vaddr, struct vm_area_struct *vma)
+{
+	copy_highpage(to, from);
+	flush_dcache_page(to);
+}
+EXPORT_SYMBOL_GPL(copy_user_highpage);