add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/parisc/lib/memcpy.c
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@@ -1,26 +1,12 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *    Optimized memory copy routines.
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  *
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  *    Copyright (C) 2004 Randolph Chung <tausq@debian.org>
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  *    Copyright (C) 2013-2017 Helge Deller <deller@gmx.de>
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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 as published by
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- *    the Free Software Foundation; either version 2, or (at your option)
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- *    any later version.
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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, write to the Free Software
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- *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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- *
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  *    Portions derived from the GNU C Library
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  *    Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
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- *
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  */
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 #include <linux/module.h>
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@@ -71,14 +57,10 @@
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 EXPORT_SYMBOL(raw_copy_in_user);
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 EXPORT_SYMBOL(memcpy);
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-long probe_kernel_read(void *dst, const void *src, size_t size)
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+bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
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 {
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-	unsigned long addr = (unsigned long)src;
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-
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-	if (addr < PAGE_SIZE)
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-		return -EFAULT;
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-
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+	if ((unsigned long)unsafe_src < PAGE_SIZE)
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+		return false;
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 	/* check for I/O space F_EXTEND(0xfff00000) access as well? */
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-
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-	return __probe_kernel_read(dst, src, size);
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+	return true;
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 }