[PATCH 2/8] mm: memcontrol: export root_mem_cgroup

Johannes Weiner
2015-10-22T04:22:07Z

A later patch will need this symbol in files other than memcontrol.c,
so export it now and replace mem_cgroup_root_css at the same time.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
include/linux/memcontrol.h | 3 ++-
mm/backing-dev.c | 2 +-
mm/memcontrol.c | 5 ++---
3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 805da1f..19ff87b 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -275,7 +275,8 @@ struct mem_cgroup {
struct mem_cgroup_per_node *nodeinfo[0];
/* WARNING: nodeinfo must be the last member here */
};
-extern struct cgroup_subsys_state *mem_cgroup_root_css;
+
+extern struct mem_cgroup *root_mem_cgroup;

/**
* mem_cgroup_events - count memory events against a cgroup
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 095b23b..73ab967 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -702,7 +702,7 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)

ret = wb_init(&bdi->wb, bdi, 1, GFP_KERNEL);
if (!ret) {
- bdi->wb.memcg_css = mem_cgroup_root_css;
+ bdi->wb.memcg_css = &root_mem_cgroup->css;
bdi->wb.blkcg_css = blkcg_root_css;
}
return ret;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a8ccdbc..e54f434 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -76,9 +76,9 @@
struct cgroup_subsys memory_cgrp_subsys __read_mostly;
EXPORT_SYMBOL(memory_cgrp_subsys);

+struct mem_cgroup *root_mem_cgroup __read_mostly;
+
#define MEM_CGROUP_RECLAIM_RETRIES 5
-static struct mem_cgroup *root_mem_cgroup __read_mostly;
-struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;

/* Whether the swap controller is active */
#ifdef CONFIG_MEMCG_SWAP
@@ -4213,7 +4213,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
/* root ? */
if (parent_css == NULL) {
root_mem_cgroup = memcg;
- mem_cgroup_root_css = &memcg->css;
page_counter_init(&memcg->memory, NULL);
memcg->high = PAGE_COUNTER_MAX;
memcg->soft_limit = PAGE_COUNTER_MAX;
--
2.6.1