[PATCH 15/36] memcg: export get_mem_cgroup_from_mm()

[j.glisse@xxxxxxxxx]

From: Jérôme Glisse <jglisse@xxxxxxxxxx>

Usefull for HMM when trying to uncharge freshly allocated anonymous
pages after error inside migration memory migration path.

Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
---
 include/linux/memcontrol.h | 7 +++++++
 mm/memcontrol.c            | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 6c89181..488748e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -93,6 +93,7 @@ bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
 
 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
+extern struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
 
 extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
 extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
@@ -275,6 +276,12 @@ static inline struct cgroup_subsys_state
 	return NULL;
 }
 
+
+static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
+{
+	return NULL;
+}
+
 static inline struct mem_cgroup *
 mem_cgroup_iter(struct mem_cgroup *root,
 		struct mem_cgroup *prev,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 14c2f20..360d9e0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -966,7 +966,7 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
 	return mem_cgroup_from_css(task_css(p, memory_cgrp_id));
 }
 
-static struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
+struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
 {
 	struct mem_cgroup *memcg = NULL;
 
@@ -988,6 +988,7 @@ static struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
 	rcu_read_unlock();
 	return memcg;
 }
+EXPORT_SYMBOL(get_mem_cgroup_from_mm);
 
 /**
  * mem_cgroup_iter - iterate over memory cgroup hierarchy
-- 
1.9.3

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