linux-kernel - [PATCH] fs/debugfs: Convert to DEFINE_SHOW

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Message-Id: <20210402121141.82-1-zuoqilin1@163.com>
Date:   Fri,  2 Apr 2021 20:11:41 +0800
From:   zuoqilin1@....com
To:     gregkh@...uxfoundation.org, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, zuoqilin <zuoqilin@...ong.com>
Subject: [PATCH] fs/debugfs: Convert to DEFINE_SHOW_ATTRIBUTE

From: zuoqilin <zuoqilin@...ong.com>

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.

Signed-off-by: zuoqilin <zuoqilin@...ong.com>
---
 fs/debugfs/file.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 686e0ad..d670ca3 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -1045,7 +1045,7 @@ void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
 }
 EXPORT_SYMBOL_GPL(debugfs_print_regs32);
 
-static int debugfs_show_regset32(struct seq_file *s, void *data)
+static int regset32_show(struct seq_file *s, void *data)
 {
 	struct debugfs_regset32 *regset = s->private;
 
@@ -1060,17 +1060,7 @@ static int debugfs_show_regset32(struct seq_file *s, void *data)
 	return 0;
 }
 
-static int debugfs_open_regset32(struct inode *inode, struct file *file)
-{
-	return single_open(file, debugfs_show_regset32, inode->i_private);
-}
-
-static const struct file_operations fops_regset32 = {
-	.open =		debugfs_open_regset32,
-	.read =		seq_read,
-	.llseek =	seq_lseek,
-	.release =	single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(regset32);
 
 /**
  * debugfs_create_regset32 - create a debugfs file that returns register values
@@ -1091,7 +1081,7 @@ void debugfs_create_regset32(const char *name, umode_t mode,
 			     struct dentry *parent,
 			     struct debugfs_regset32 *regset)
 {
-	debugfs_create_file(name, mode, parent, regset, &fops_regset32);
+	debugfs_create_file(name, mode, parent, regset, &regset32_fops);
 }
 EXPORT_SYMBOL_GPL(debugfs_create_regset32);
 
-- 
1.9.1