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[PATCH 2/2] selftests/memfd: Add null check for freepgs.

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  [PATCH 2/2] selftests/memfd: Add null check for freepgs. Thomas Meyer <thomas@m3y3r.de> - 2017-09-07 20:50 +0200

#1728375 — [PATCH 2/2] selftests/memfd: Add null check for freepgs.

User mode linux kernel has no huge pages. So this variable will be null.
Guard all tests in the shell script with a null check.

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
---
 tools/testing/selftests/memfd/run_tests.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/memfd/run_tests.sh b/tools/testing/selftests/memfd/run_tests.sh
index daabb350697c..0b65bacf8694 100755
--- a/tools/testing/selftests/memfd/run_tests.sh
+++ b/tools/testing/selftests/memfd/run_tests.sh
@@ -46,7 +46,7 @@ fi
 # If still not enough huge pages available, exit.  But, give back any huge
 # pages potentially allocated above.
 #
-if [ $freepgs -lt $hpages_test ]; then
+if [ -n "$freepgs" ] && [ $freepgs -lt $hpages_test ]; then
 	# nr_hugepgs non-zero only if we attempted to increase
 	if [ -n "$nr_hugepgs" ]; then
 		echo $nr_hugepgs > /proc/sys/vm/nr_hugepages
-- 
2.11.0

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