add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/ptp/ptp_kvm.c
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@@ -1,18 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Virtual PTP 1588 clock for use with KVM guests
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  *
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  * Copyright (C) 2017 Red Hat Inc.
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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 of the License, or
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- *  (at your option) 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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  */
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 #include <linux/device.h>
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 #include <linux/err.h>
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@@ -32,7 +22,7 @@
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 	struct ptp_clock_info caps;
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 };
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-DEFINE_SPINLOCK(kvm_ptp_lock);
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+static DEFINE_SPINLOCK(kvm_ptp_lock);
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 static struct pvclock_vsyscall_time_info *hv_clock;
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