mm/vmstat.c: convert to use DEFINE_SEQ_ATTRIBUTE macro

Use DEFINE_SEQ_ATTRIBUTE macro to simplify the code.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200509064031.181091-3-wangkefeng.wang@huawei.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmstat.c b/mm/vmstat.c
index a7db29f..3fb23a2 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -2069,24 +2069,14 @@ static int unusable_show(struct seq_file *m, void *arg)
        return 0;
 }
 
-static const struct seq_operations unusable_op = {
+static const struct seq_operations unusable_sops = {
        .start  = frag_start,
        .next   = frag_next,
        .stop   = frag_stop,
        .show   = unusable_show,
 };
 
-static int unusable_open(struct inode *inode, struct file *file)
-{
-       return seq_open(file, &unusable_op);
-}
-
-static const struct file_operations unusable_file_ops = {
-       .open           = unusable_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = seq_release,
-};
+DEFINE_SEQ_ATTRIBUTE(unusable);
 
 static void extfrag_show_print(struct seq_file *m,
                                        pg_data_t *pgdat, struct zone *zone)
@@ -2121,24 +2111,14 @@ static int extfrag_show(struct seq_file *m, void *arg)
        return 0;
 }
 
-static const struct seq_operations extfrag_op = {
+static const struct seq_operations extfrag_sops = {
        .start  = frag_start,
        .next   = frag_next,
        .stop   = frag_stop,
        .show   = extfrag_show,
 };
 
-static int extfrag_open(struct inode *inode, struct file *file)
-{
-       return seq_open(file, &extfrag_op);
-}
-
-static const struct file_operations extfrag_file_ops = {
-       .open           = extfrag_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = seq_release,
-};
+DEFINE_SEQ_ATTRIBUTE(extfrag);
 
 static int __init extfrag_debug_init(void)
 {
@@ -2147,10 +2127,10 @@ static int __init extfrag_debug_init(void)
        extfrag_debug_root = debugfs_create_dir("extfrag", NULL);
 
        debugfs_create_file("unusable_index", 0444, extfrag_debug_root, NULL,
-                           &unusable_file_ops);
+                           &unusable_fops);
 
        debugfs_create_file("extfrag_index", 0444, extfrag_debug_root, NULL,
-                           &extfrag_file_ops);
+                           &extfrag_fops);
 
        return 0;
 }