add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/arm64/lib/uaccess_flushcache.c
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@@ -1,17 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2017 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/uaccess.h>
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@@ -39,7 +28,11 @@
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 unsigned long __copy_user_flushcache(void *to, const void __user *from,
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 				     unsigned long n)
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 {
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-	unsigned long rc = __arch_copy_from_user(to, from, n);
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+	unsigned long rc;
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+
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+	uaccess_enable_not_uao();
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+	rc = __arch_copy_from_user(to, from, n);
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+	uaccess_disable_not_uao();
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 	/* See above */
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 	__clean_dcache_area_pop(to, n - rc);