kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/arm64/mm/copypage.c
..
..
@@ -1,37 +1,46 @@
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+// 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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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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+#include <linux/bitops.h>
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 #include <linux/mm.h>
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11
 
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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 __cpu_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
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+void copy_highpage(struct page *to, struct page *from)
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 {
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-	struct page *page = virt_to_page(kto);
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+	void *kto = page_address(to);
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+	void *kfrom = page_address(from);
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+
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 	copy_page(kto, kfrom);
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-	flush_dcache_page(page);
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-}
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-EXPORT_SYMBOL_GPL(__cpu_copy_user_page);
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-void __cpu_clear_user_page(void *kaddr, unsigned long vaddr)
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-{
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-	clear_page(kaddr);
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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_GPL(__cpu_clear_user_page);
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+EXPORT_SYMBOL(copy_highpage);
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+
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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);