add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/virtio/ringtest/ring.c
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@@ -1,7 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2016 Red Hat, Inc.
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  * Author: Michael S. Tsirkin <mst@redhat.com>
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- * This work is licensed under the terms of the GNU GPL, version 2.
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  *
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  * Simple descriptor-based ring. virtio 0.9 compatible event index is used for
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  * signalling, unconditionally.