arm64/mm/copypage.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Based on arch/arm/mm/copypage.c
0004  *
0005  * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
0006  * Copyright (C) 2012 ARM Ltd.
0007  */
0008
0009 #include <linux/bitops.h>
0010 #include <linux/mm.h>
0011
0012 #include <asm/page.h>
0013 #include <asm/cacheflush.h>
0014 #include <asm/cpufeature.h>
0015 #include <asm/mte.h>
0016
0017 void copy_highpage(struct page *to, struct page *from)
0018 {
0019     void *kto = page_address(to);
0020     void *kfrom = page_address(from);
0021
0022     copy_page(kto, kfrom);
0023
0024     if (system_supports_mte() && test_bit(PG_mte_tagged, &from->flags)) {
0025         set_bit(PG_mte_tagged, &to->flags);
0026         mte_copy_page_tags(kto, kfrom);
0027     }
0028 }
0029 EXPORT_SYMBOL(copy_highpage);
0030
0031 void copy_user_highpage(struct page *to, struct page *from,
0032             unsigned long vaddr, struct vm_area_struct *vma)
0033 {
0034     copy_highpage(to, from);
0035     flush_dcache_page(to);
0036 }
0037 EXPORT_SYMBOL_GPL(copy_user_highpage);