[patch 2/6] mm: memcg: convert numa stat to read_seq_string interface

[Johannes Weiner]

Instead of using the raw seq_file file interface, switch over to the
read_seq_string cftype callback and let cgroup core code set up the
seq_file.

Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 mm/memcontrol.c |   23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index aef89c1..f0d248b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4345,12 +4345,12 @@ mem_cgroup_get_total_stat(struct mem_cgroup *memcg, struct mcs_total_stat *s)
 }
 
 #ifdef CONFIG_NUMA
-static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
+static int mem_control_numa_stat_show(struct cgroup *cont, struct cftype *cft,
+				      struct seq_file *m)
 {
 	int nid;
 	unsigned long total_nr, file_nr, anon_nr, unevictable_nr;
 	unsigned long node_nr;
-	struct cgroup *cont = m->private;
 	struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
 
 	total_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL);
@@ -4825,22 +4825,6 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
 	return 0;
 }
 
-#ifdef CONFIG_NUMA
-static const struct file_operations mem_control_numa_stat_file_operations = {
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
-
-static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
-{
-	struct cgroup *cont = file->f_dentry->d_parent->d_fsdata;
-
-	file->f_op = &mem_control_numa_stat_file_operations;
-	return single_open(file, mem_control_numa_stat_show, cont);
-}
-#endif /* CONFIG_NUMA */
-
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
 {
@@ -4928,8 +4912,7 @@ static struct cftype mem_cgroup_files[] = {
 #ifdef CONFIG_NUMA
 	{
 		.name = "numa_stat",
-		.open = mem_control_numa_stat_open,
-		.mode = S_IRUGO,
+		.read_seq_string = mem_control_numa_stat_show,
 	},
 #endif
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
-- 
1.7.10.1

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