arch/arm64/mm/copypage.c

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