add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/fs/fscache/object.c
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@@ -1,14 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /* FS-Cache object state machine handler
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  *
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  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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  * Written by David Howells (dhowells@redhat.com)
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  *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- *
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- * See Documentation/filesystems/caching/object.txt for a description of the
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+ * See Documentation/filesystems/caching/object.rst for a description of the
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  * object state machine and the in-kernel representations.
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  */
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@@ -299,7 +295,7 @@
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  *
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  * Initialise a cache object description to its basic values.
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  *
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- * See Documentation/filesystems/caching/backend-api.txt for a complete
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+ * See Documentation/filesystems/caching/backend-api.rst for a complete
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  * description.
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  */
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 void fscache_object_init(struct fscache_object *object,