| 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(to: kto, from: kfrom); |
| 23 | |
| 24 | if (kasan_hw_tags_enabled()) |
| 25 | page_kasan_tag_reset(page: 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(page: to); |
| 41 | } |
| 42 | EXPORT_SYMBOL_GPL(copy_user_highpage); |
| 43 |