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
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 (kasan_hw_tags_enabled())
25 page_kasan_tag_reset(to);
26
27 if (system_supports_mte() && page_mte_tagged(from)) {
28 /* It's a new page, shouldn't have been tagged yet */
29 WARN_ON_ONCE(!try_page_mte_tagging(to));
30 mte_copy_page_tags(kto, kfrom);
31 set_page_mte_tagged(to);
32 }
33 }
34 EXPORT_SYMBOL(copy_highpage);
35
36 void copy_user_highpage(struct page *to, struct page *from,
37 unsigned long vaddr, struct vm_area_struct *vma)
38 {
39 copy_highpage(to, from);
40 flush_dcache_page(to);
41 }
42 EXPORT_SYMBOL_GPL(copy_user_highpage);
43
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