1 files changed, 14 insertions, 38 deletions

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index fcb9884df618..c9d625ca659e 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -129,20 +129,22 @@ int __must_check res_counter_charge(struct res_counter *counter,
 void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
 void res_counter_uncharge(struct res_counter *counter, unsigned long val);
 
-static inline bool res_counter_limit_check_locked(struct res_counter *cnt)
-{
-        if (cnt->usage < cnt->limit)
-                return true;
-
-        return false;
-}
-
-static inline bool res_counter_soft_limit_check_locked(struct res_counter *cnt)
+/**
+ * res_counter_margin - calculate chargeable space of a counter
+ * @cnt: the counter
+ *
+ * Returns the difference between the hard limit and the current usage
+ * of resource counter @cnt.
+ */
+static inline unsigned long long res_counter_margin(struct res_counter *cnt)
 {
-        if (cnt->usage < cnt->soft_limit)
-                return true;
+        unsigned long long margin;
+        unsigned long flags;
 
-        return false;
+        spin_lock_irqsave(&cnt->lock, flags);
+        margin = cnt->limit - cnt->usage;
+        spin_unlock_irqrestore(&cnt->lock, flags);
+        return margin;
 }
 
 /**
@@ -167,32 +169,6 @@ res_counter_soft_limit_excess(struct res_counter *cnt)
         return excess;
 }
 
-/*
- * Helper function to detect if the cgroup is within it's limit or
- * not. It's currently called from cgroup_rss_prepare()
- */
-static inline bool res_counter_check_under_limit(struct res_counter *cnt)
-{
-        bool ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        ret = res_counter_limit_check_locked(cnt);
-        spin_unlock_irqrestore(&cnt->lock, flags);
-        return ret;
-}
-
-static inline bool res_counter_check_under_soft_limit(struct res_counter *cnt)
-{
-        bool ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        ret = res_counter_soft_limit_check_locked(cnt);
-        spin_unlock_irqrestore(&cnt->lock, flags);
-        return ret;
-}
-
 static inline void res_counter_reset_max(struct res_counter *cnt)
 {
         unsigned long flags;