selftests/zram: must be run as root

Adding new functionality check_prereqs() to check test must be run as root
Signed-off-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/zram/zram.sh

 #!/bin/bash
 TCID="zram.sh"
 
+check_prereqs()
+{
+	local msg="skip all tests:"
+
+	if [ $UID != 0 ]; then
+		echo $msg must be run as root >&2
+		exit 0
+	fi
+}
+
 run_zram () {
 echo "--------------------"
 echo "running zram tests"
@@ -10,6 +20,8 @@ echo ""
 ./zram02.sh
 }
 
+check_prereqs
+
 # check zram module exists
 MODULE_PATH=/lib/modules/`uname -r`/kernel/drivers/block/zram/zram.ko
 if [ -f $MODULE_PATH ]; then

tools/testing/selftests/zram/zram01.sh

@@ -79,6 +79,7 @@ zram_fill_fs()
 	echo "zram compression ratio: $(echo "scale=2; $v / 100 " | bc):1: OK"
 }
 
+check_prereqs
 zram_load
 zram_max_streams
 zram_compress_alg

tools/testing/selftests/zram/zram02.sh

@@ -37,6 +37,7 @@ zram_max_streams="2"
 zram_sizes="1048576" # 1M
 zram_mem_limits="1M"
 
+check_prereqs
 zram_load
 zram_max_streams
 zram_set_disksizes

tools/testing/selftests/zram/zram_lib.sh

@@ -20,6 +20,16 @@ dev_mounted=-1
 
 trap INT
 
+check_prereqs()
+{
+	local msg="skip all tests:"
+
+	if [ $UID != 0 ]; then
+		echo $msg must be run as root >&2
+		exit 0
+	fi
+}
+
 zram_cleanup()
 {
 	echo "zram cleanup"