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); 41