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mm: memcontrol: export root_mem_cgroup

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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>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-01-14 15:20:56 -08:00 committed by Linus Torvalds
parent 036404183e
commit 7d828602e5
3 changed files with 5 additions and 5 deletions
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3
include/linux/memcontrol.h
View File

@ -265,7 +265,8 @@ 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

2
mm/backing-dev.c
View File

@ -672,7 +672,7 @@ 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;

5
mm/memcontrol.c
View File

@ -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
@ -4241,7 +4241,6 @@ 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;