add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/mm/cleancache.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Cleancache frontend
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  *
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@@ -7,8 +8,6 @@
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  *
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  * Copyright (C) 2009-2010 Oracle Corp. All rights reserved.
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  * Author: Dan Magenheimer
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- *
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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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 #include <linux/module.h>
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@@ -305,8 +304,7 @@
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 {
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 #ifdef CONFIG_DEBUG_FS
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 	struct dentry *root = debugfs_create_dir("cleancache", NULL);
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-	if (root == NULL)
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-		return -ENXIO;
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+
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 	debugfs_create_u64("succ_gets", 0444, root, &cleancache_succ_gets);
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 	debugfs_create_u64("failed_gets", 0444, root, &cleancache_failed_gets);
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 	debugfs_create_u64("puts", 0444, root, &cleancache_puts);