[Devel] [RFC][PATCH 2/4] res_counter check usage under val

[KAMEZAWA Hiroyuki]

Add an interface to check usage is below "val"

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>

 include/linux/res_counter.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

Index: mmtom-stamp-2008-07-15-15-39/include/linux/res_counter.h
===================================================================
--- mmtom-stamp-2008-07-15-15-39.orig/include/linux/res_counter.h
+++ mmtom-stamp-2008-07-15-15-39/include/linux/res_counter.h
@@ -191,4 +191,17 @@ static inline int res_counter_set_limit(
 	return ret;
 }
 
+static inline int res_counter_check_under_val(struct res_counter *cnt,
+	unsigned long long val)
+{
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&cnt->flags, flags);
+	if (cnt->usage < val)
+		ret = 1;
+	spin_unlock_irqrestore(&cnt->flags, flags);
+	return ret;
+}
+
 #endif

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