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46 lines
1.2 KiB
46 lines
1.2 KiB
// 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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struct page *kto = page_address(to); |
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struct page *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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