[LTP] [PATCH] memcg : fix various test failures

[liubo <liubo-fnst@cn.fujitsu.com>]

In memcg testcases,

1. use /dev/memcg consistently

2. for testcase_25, since 2.6.31, writing -1 to 
   memory.limit_in_bytes will reset to unlimit.

3. for testcase_35, writing to memory.force_empty for 
   non-empty cgroup should return failure.

Signed-off-by: Liu Bo <liubo-fnst@cn.fujitsu.com>

---
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_function_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_function_test.sh
index e48c8dd..e22954f 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_function_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_function_test.sh
@@ -398,8 +398,12 @@ testcase_24()
 testcase_25()
 {
 	echo -1 > memory.limit_in_bytes 2> /dev/null
-#	result $(( !($? != 0) ))  "return value is $?"  //lizf
-	result $(( !($? == 0) ))  "return value is $?"
+	tst_kvercmp 2 6 31
+	if [ $? -eq 0 ]; then
+		result $(( !($? != 0) ))  "return value is $?"
+       else
+		result $(( !($? == 0) ))  "return value is $?"
+	fi
 }
 
 testcase_26()
@@ -488,8 +492,8 @@ testcase_35()
 {
 	# writing to non-empty top mem cgroup's force_empty
 	# should return failure
-	echo 1 > /memcg/memory.force_empty 2> /dev/null
-	result $(( $? )) "return value is $?"
+	echo 1 > /dev/memcg/memory.force_empty 2> /dev/null
+	result $(( !$? )) "return value is $?"
 }
 
 # Case 36 - 38: Test that group and subgroup have no relationship
diff --git a/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh b/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh
index 1e17525..86b8cb9 100755
--- a/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh
+++ b/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh
@@ -68,11 +68,11 @@ run_stress()
 
 	for ((i = 0; i < $1; i++))
 	{
-		mkdir /memcg/$i 2> /dev/null
+		mkdir /dev/memcg/$i 2> /dev/null
 		./memcg_process_stress $2 $3 &
 		pid[$i]=$!
 
-		echo ${pid[$i]} > /memcg/$i/tasks
+		echo ${pid[$i]} > /dev/memcg/$i/tasks
 	}
 
 	for ((i = 0; i < $1; i++))
@@ -87,7 +87,7 @@ run_stress()
 		/bin/kill -s SIGINT ${pid[$i]} 2> /dev/null
 		wait ${pid[$i]}
 
-		rmdir /memcg/$i 2> /dev/null
+		rmdir /dev/memcg/$i 2> /dev/null
 	}
 
 	cleanup;

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