[PATCH 4/8] memcg: convert to use cgroup_from_id()

[Li Zefan <lizefan@huawei.com>]

This is a preparation to kill css_id.

Signed-off-by: Li Zefan <lizefan@huawei.com>
---
 mm/memcontrol.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 14f1375..3561d0b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2769,15 +2769,15 @@ static void __mem_cgroup_cancel_local_charge(struct mem_cgroup *memcg,
  */
 static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
 {
-	struct cgroup_subsys_state *css;
+	struct cgroup *cgrp;
 
 	/* ID 0 is unused ID */
 	if (!id)
 		return NULL;
-	css = css_lookup(&mem_cgroup_subsys, id);
-	if (!css)
+	cgrp = cgroup_from_id(&mem_cgroup_subsys, id);
+	if (!cgrp)
 		return NULL;
-	return mem_cgroup_from_css(css);
+	return mem_cgroup_from_cont(cgrp);
 }
 
 struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
-- 
1.8.0.2

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