]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/arm64/mm/copypage.c
1 // SPDX-License-Identifier: GPL-2.0-only
3 * Based on arch/arm/mm/copypage.c
5 * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
6 * Copyright (C) 2012 ARM Ltd.
9 #include <linux/bitops.h>
13 #include <asm/cacheflush.h>
14 #include <asm/cpufeature.h>
17 void copy_highpage(struct page
*to
, struct page
*from
)
19 struct page
*kto
= page_address(to
);
20 struct page
*kfrom
= page_address(from
);
22 copy_page(kto
, kfrom
);
24 if (system_supports_mte() && test_bit(PG_mte_tagged
, &from
->flags
)) {
25 set_bit(PG_mte_tagged
, &to
->flags
);
26 page_kasan_tag_reset(to
);
28 * We need smp_wmb() in between setting the flags and clearing the
29 * tags because if another thread reads page->flags and builds a
30 * tagged address out of it, there is an actual dependency to the
31 * memory access, but on the current thread we do not guarantee that
32 * the new page->flags are visible before the tags were updated.
35 mte_copy_page_tags(kto
, kfrom
);
38 EXPORT_SYMBOL(copy_highpage
);
40 void copy_user_highpage(struct page
*to
, struct page
*from
,
41 unsigned long vaddr
, struct vm_area_struct
*vma
)
43 copy_highpage(to
, from
);
44 flush_dcache_page(to
);
46 EXPORT_SYMBOL_GPL(copy_user_highpage
);