fs/dirty_pages: remove set but not used variable 'm'

euler inclusion
category: feature
bugzilla: 46858
CVE: NA

---------------------------

Commit 214b35a353e7 ("fs/dirty_pages: fix kernel panic in concurrency
mode") move initialization of buffer from proc_dpages_open() to
seq_read_dirty(), and left a variable 'm' set but not used.

Fixes: 214b35a353e7 ("fs/dirty_pages: fix kernel panic in concurrency mode")
Signed-off-by: Nyu kuai <yukuai3@huawei.com>
Reviewed-by: Nzhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Nyangerkun <yangerkun@huawei.com>
Signed-off-by: NDianfang Zhang <zhangdianfang@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>

fs/dirty_pages.c

@@ -309,18 +309,13 @@ static ssize_t write_proc(
 
 static int proc_dpages_open(struct inode *inode, struct file *filp)
 {
-	int ret;
-	struct seq_file *m;
-
 	if (buf_dirty == NULL || buf_size == 0) {
 		pr_warn("please allocate buffer before getting dirty pages\n");
 		return -ENOMEM;
 	}
 
-	ret = single_open(filp, proc_dpages_show, NULL);
-	m = filp->private_data;
+	return single_open(filp, proc_dpages_show, NULL);
 
-	return ret;
 }
 
 static int seq_release_dirty(struct inode *inode, struct file *file)