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-rw-r--r--include/linux/memcontrol.h10
-rw-r--r--mm/memcontrol.c2
-rw-r--r--mm/rmap.c4
3 files changed, 7 insertions, 9 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 9815951ec99..925d57b236a 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -51,10 +51,8 @@ extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
-static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
-{
- return rcu_dereference(mm->mem_cgroup);
-}
+#define vm_match_cgroup(mm, cgroup) \
+ ((cgroup) == rcu_dereference((mm)->mem_cgroup))
extern int mem_cgroup_prepare_migration(struct page *page);
extern void mem_cgroup_end_migration(struct page *page);
@@ -123,9 +121,9 @@ static inline int mem_cgroup_cache_charge(struct page *page,
return 0;
}
-static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
+static inline int vm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
{
- return NULL;
+ return 1;
}
static inline int task_in_mem_cgroup(struct task_struct *task,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5c2c702af61..6bded84c20c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -399,7 +399,7 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
int ret;
task_lock(task);
- ret = task->mm && mm_cgroup(task->mm) == mem;
+ ret = task->mm && vm_match_cgroup(task->mm, mem);
task_unlock(task);
return ret;
}
diff --git a/mm/rmap.c b/mm/rmap.c
index a0e92a263d1..8fd527c4e2b 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -321,7 +321,7 @@ static int page_referenced_anon(struct page *page,
* counting on behalf of references from different
* cgroups
*/
- if (mem_cont && (mm_cgroup(vma->vm_mm) != mem_cont))
+ if (mem_cont && !vm_match_cgroup(vma->vm_mm, mem_cont))
continue;
referenced += page_referenced_one(page, vma, &mapcount);
if (!mapcount)
@@ -382,7 +382,7 @@ static int page_referenced_file(struct page *page,
* counting on behalf of references from different
* cgroups
*/
- if (mem_cont && (mm_cgroup(vma->vm_mm) != mem_cont))
+ if (mem_cont && !vm_match_cgroup(vma->vm_mm, mem_cont))
continue;
if ((vma->vm_flags & (VM_LOCKED|VM_MAYSHARE))
== (VM_LOCKED|VM_MAYSHARE)) {