add REDIRECT

hc

2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565

 kernel/arch/arm64/lib/clear_page.S
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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) 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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@@ -25,8 +14,9 @@
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  * Parameters:
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  *	x0 - dest
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  */
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-ENTRY(clear_page)
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+SYM_FUNC_START_PI(clear_page)
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 	mrs	x1, dczid_el0
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+	tbnz	x1, #4, 2f	/* Branch if DC ZVA is prohibited */
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 	and	w1, w1, #0xf
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 	mov	x2, #4
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 	lsl	x1, x2, x1
..
..
@@ -36,4 +26,14 @@
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 	tst	x0, #(PAGE_SIZE - 1)
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 	b.ne	1b
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 	ret
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-ENDPROC(clear_page)
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+
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+2:	stnp	xzr, xzr, [x0]
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+	stnp	xzr, xzr, [x0, #16]
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+	stnp	xzr, xzr, [x0, #32]
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+	stnp	xzr, xzr, [x0, #48]
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+	add	x0, x0, #64
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+	tst	x0, #(PAGE_SIZE - 1)
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+	b.ne	2b
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+	ret
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+SYM_FUNC_END_PI(clear_page)
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+EXPORT_SYMBOL(clear_page)