change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/mtd/mtdswap.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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  * Swap block device support for MTDs
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  * Turns an MTD device into a swap device with block wear leveling
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@@ -8,20 +9,6 @@
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  *
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  * Based on Richard Purdie's earlier implementation in 2007. Background
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  * support and lock-less operation written by Adrian Hunter.
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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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- * version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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- * 02110-1301 USA
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  */
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 #include <linux/kernel.h>
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@@ -1265,23 +1252,11 @@
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 	return 0;
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 }
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-
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-static int mtdswap_open(struct inode *inode, struct file *file)
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-{
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-	return single_open(file, mtdswap_show, inode->i_private);
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-}
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-
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-static const struct file_operations mtdswap_fops = {
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-	.open		= mtdswap_open,
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-	.read		= seq_read,
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-	.llseek		= seq_lseek,
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-	.release	= single_release,
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-};
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+DEFINE_SHOW_ATTRIBUTE(mtdswap);
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 static int mtdswap_add_debugfs(struct mtdswap_dev *d)
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 {
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 	struct dentry *root = d->mtd->dbg.dfs_dir;
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-	struct dentry *dent;
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 	if (!IS_ENABLED(CONFIG_DEBUG_FS))
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 		return 0;
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@@ -1289,12 +1264,7 @@
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 	if (IS_ERR_OR_NULL(root))
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 		return -1;
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-	dent = debugfs_create_file("mtdswap_stats", S_IRUSR, root, d,
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-				&mtdswap_fops);
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-	if (!dent) {
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-		dev_err(d->dev, "debugfs_create_file failed\n");
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-		return -1;
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-	}
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+	debugfs_create_file("mtdswap_stats", S_IRUSR, root, d, &mtdswap_fops);
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 	return 0;
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 }