[PATCH 4.14 027/217] selftests: vm: return Kselftest Skip code for skipped tests

Greg Kroah-Hartman
2018-08-23T08:20:12Z

From: "Shuah Khan (Samsung OSG)" <shuah@kernel.org>

[ Upstream commit a4d7537789724985cafbc9260a31ca4f2b7cf123 ]

When vm test is skipped because of unmet dependencies and/or unsupported
configuration, it exits with error which is treated as a fail by the
Kselftest framework. This leads to false negative result even when the
test could not be run.

Change it to return kselftest skip code when a test gets skipped to
clearly report that the test could not be run.

Kselftest framework SKIP code is 4 and the framework prints appropriate
messages to indicate that the test is skipped.

Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/testing/selftests/vm/compaction_test.c | 4 +++-
tools/testing/selftests/vm/mlock2-tests.c | 12 +++++++-----
tools/testing/selftests/vm/run_vmtests | 5 ++++-
tools/testing/selftests/vm/userfaultfd.c | 4 +++-
4 files changed, 17 insertions(+), 8 deletions(-)

--- a/tools/testing/selftests/vm/compaction_test.c
+++ b/tools/testing/selftests/vm/compaction_test.c
@@ -16,6 +16,8 @@
#include <unistd.h>
#include <string.h>

+#include "../kselftest.h"
+
#define MAP_SIZE 1048576

struct map_list {
@@ -169,7 +171,7 @@ int main(int argc, char **argv)
printf("Either the sysctl compact_unevictable_allowed is not\n"
"set to 1 or couldn't read the proc file.\n"
"Skipping the test\n");
- return 0;
+ return KSFT_SKIP;
}

lim.rlim_cur = RLIM_INFINITY;
--- a/tools/testing/selftests/vm/mlock2-tests.c
+++ b/tools/testing/selftests/vm/mlock2-tests.c
@@ -9,6 +9,8 @@
#include <stdbool.h>
#include "mlock2.h"

+#include "../kselftest.h"
+
struct vm_boundaries {
unsigned long start;
unsigned long end;
@@ -303,7 +305,7 @@ static int test_mlock_lock()
if (mlock2_(map, 2 * page_size, 0)) {
if (errno == ENOSYS) {
printf("Cannot call new mlock family, skipping test\n");
- _exit(0);
+ _exit(KSFT_SKIP);
}
perror("mlock2(0)");
goto unmap;
@@ -412,7 +414,7 @@ static int test_mlock_onfault()
if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) {
if (errno == ENOSYS) {
printf("Cannot call new mlock family, skipping test\n");
- _exit(0);
+ _exit(KSFT_SKIP);
}
perror("mlock2(MLOCK_ONFAULT)");
goto unmap;
@@ -425,7 +427,7 @@ static int test_mlock_onfault()
if (munlock(map, 2 * page_size)) {
if (errno == ENOSYS) {
printf("Cannot call new mlock family, skipping test\n");
- _exit(0);
+ _exit(KSFT_SKIP);
}
perror("munlock()");
goto unmap;
@@ -457,7 +459,7 @@ static int test_lock_onfault_of_present(
if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) {
if (errno == ENOSYS) {
printf("Cannot call new mlock family, skipping test\n");
- _exit(0);
+ _exit(KSFT_SKIP);
}
perror("mlock2(MLOCK_ONFAULT)");
goto unmap;
@@ -583,7 +585,7 @@ static int test_vma_management(bool call
if (call_mlock && mlock2_(map, 3 * page_size, MLOCK_ONFAULT)) {
if (errno == ENOSYS) {
printf("Cannot call new mlock family, skipping test\n");
- _exit(0);
+ _exit(KSFT_SKIP);
}
perror("mlock(ONFAULT)\n");
goto out;
--- a/tools/testing/selftests/vm/run_vmtests
+++ b/tools/testing/selftests/vm/run_vmtests
@@ -2,6 +2,9 @@
# SPDX-License-Identifier: GPL-2.0
#please run as root

+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
mnt=./huge
exitcode=0

@@ -36,7 +39,7 @@ if [ -n "$freepgs" ] && [ -n "$hpgsize_K
echo $(( $lackpgs + $nr_hugepgs )) > /proc/sys/vm/nr_hugepages
if [ $? -ne 0 ]; then
echo "Please run this test as root"
- exit 1
+ exit $ksft_skip
fi
while read name size unit; do
if [ "$name" = "HugePages_Free:" ]; then
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -69,6 +69,8 @@
#include <setjmp.h>
#include <stdbool.h>

+#include "../kselftest.h"
+
#ifdef __NR_userfaultfd

static unsigned long nr_cpus, nr_pages, nr_pages_per_cpu, page_size;
@@ -1322,7 +1324,7 @@ int main(int argc, char **argv)
int main(void)
{
printf("skip: Skipping userfaultfd test (missing __NR_userfaultfd)\n");
- return 0;
+ return KSFT_SKIP;
}

#endif /* __NR_userfaultfd */