add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/arm64/lib/clear_user.S
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@@ -1,23 +1,13 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Based on arch/arm/lib/clear_user.S
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  *
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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/linkage.h>
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 #include <asm/asm-uaccess.h>
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+#include <asm/assembler.h>
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 	.text
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@@ -29,8 +19,7 @@
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  *
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  * Alignment fixed up by hardware.
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  */
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-ENTRY(__arch_clear_user)
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-	uaccess_enable_not_uao x2, x3, x4
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+SYM_FUNC_START(__arch_clear_user)
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 	mov	x2, x1			// save the size for fixup return
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 	subs	x1, x1, #8
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 	b.mi	2f
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@@ -50,13 +39,12 @@
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 	b.mi	5f
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 uao_user_alternative 9f, strb, sttrb, wzr, x0, 0
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 5:	mov	x0, #0
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-	uaccess_disable_not_uao x2, x3
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 	ret
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-ENDPROC(__arch_clear_user)
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+SYM_FUNC_END(__arch_clear_user)
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+EXPORT_SYMBOL(__arch_clear_user)
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 	.section .fixup,"ax"
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 	.align	2
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 9:	mov	x0, x2			// return the original size
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-	uaccess_disable_not_uao x2, x3
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 	ret
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 	.previous