add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/boot/cmdline.c
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@@ -1,10 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* -*- linux-c -*- ------------------------------------------------------- *
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  *
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  *   Copyright (C) 1991, 1992 Linus Torvalds
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  *   Copyright 2007 rPath, Inc. - All Rights Reserved
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- *
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- *   This file is part of the Linux kernel, and is made available under
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- *   the terms of the GNU General Public License version 2.
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  *
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  * ----------------------------------------------------------------------- */
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@@ -56,7 +54,7 @@
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 			/* else */
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 			state = st_wordcmp;
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 			opptr = option;
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-			/* fall through */
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+			fallthrough;
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 		case st_wordcmp:
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 			if (c == '=' && !*opptr) {
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@@ -131,7 +129,7 @@
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 			state = st_wordcmp;
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 			opptr = option;
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 			wstart = pos;
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-			/* fall through */
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+			fallthrough;
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 		case st_wordcmp:
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 			if (!*opptr)