add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/mdio.c
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@@ -1,10 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * mdio.c: Generic support for MDIO-compatible transceivers
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  * Copyright 2006-2009 Solarflare Communications Inc.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published
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- * by the Free Software Foundation, incorporated herein by reference.
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  */
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 #include <linux/kernel.h>