1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Based on arch/arm/mm/copypage.c
4 *
5 * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
6 * Copyright (C) 2012 ARM Ltd.
7 */
8
9 #include <linux/bitops.h>
10 #include <linux/mm.h>
11
12 #include <asm/page.h>
13 #include <asm/cacheflush.h>
14 #include <asm/cpufeature.h>
15 #include <asm/mte.h>
16
copy_highpage(struct page * to,struct page * from)17 void copy_highpage(struct page *to, struct page *from)
18 {
19 void *kto = page_address(to);
20 void *kfrom = page_address(from);
21
22 copy_page(kto, kfrom);
23
24 if (system_supports_mte() && page_mte_tagged(from)) {
25 if (kasan_hw_tags_enabled())
26 page_kasan_tag_reset(to);
27 /* It's a new page, shouldn't have been tagged yet */
28 WARN_ON_ONCE(!try_page_mte_tagging(to));
29 mte_copy_page_tags(kto, kfrom);
30 set_page_mte_tagged(to);
31 }
32 }
33 EXPORT_SYMBOL(copy_highpage);
34
copy_user_highpage(struct page * to,struct page * from,unsigned long vaddr,struct vm_area_struct * vma)35 void copy_user_highpage(struct page *to, struct page *from,
36 unsigned long vaddr, struct vm_area_struct *vma)
37 {
38 copy_highpage(to, from);
39 flush_dcache_page(to);
40 }
41 EXPORT_SYMBOL_GPL(copy_user_highpage);
42