// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on arch/arm/mm/copypage.c
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*
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* Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
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* Copyright (C) 2012 ARM Ltd.
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*/
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#include <linux/bitops.h>
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#include <linux/mm.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/cpufeature.h>
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#include <asm/mte.h>
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void copy_highpage(struct page *to, struct page *from)
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{
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void *kto = page_address(to);
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void *kfrom = page_address(from);
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copy_page(kto, kfrom);
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if (system_supports_mte() && test_bit(PG_mte_tagged, &from->flags)) {
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set_bit(PG_mte_tagged, &to->flags);
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page_kasan_tag_reset(to);
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/*
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* We need smp_wmb() in between setting the flags and clearing the
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* tags because if another thread reads page->flags and builds a
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* tagged address out of it, there is an actual dependency to the
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* memory access, but on the current thread we do not guarantee that
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* the new page->flags are visible before the tags were updated.
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*/
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smp_wmb();
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mte_copy_page_tags(kto, kfrom);
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}
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}
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EXPORT_SYMBOL(copy_highpage);
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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copy_highpage(to, from);
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flush_dcache_page(to);
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}
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EXPORT_SYMBOL_GPL(copy_user_highpage);
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