[PATCH v5 6/6] selftests/mm: transhuge_stress: skip the test when thp not available

Chunyu Hu
2026-03-23T15:19:12Z

The test requires thp, skip the test when thp is not available to avoid
false positive.

Tested with thp disabled kernel.
Before the fix:
# --------------------------------
# running ./transhuge-stress -d 20
# --------------------------------
# TAP version 13
# 1..1
# transhuge-stress: allocate 1453 transhuge pages, using 2907 MiB virtual memory and 11 MiB of ram
# Bail out! MADV_HUGEPAGE# Planned tests != run tests (1 != 0)
# # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
# [FAIL]
not ok 60 transhuge-stress -d 20 # exit=1

After the fix:
# --------------------------------
# running ./transhuge-stress -d 20
# --------------------------------
# TAP version 13
# 1..0 # SKIP Transparent Hugepages not available
# [SKIP]
ok 5 transhuge-stress -d 20 # SKIP

Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
CC: Li Wang <liwang@redhat.com>
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
---
V3 changes:
- Add review by from Mike
- Add acked-by from David
V2 changes:
- Move the exit chunk to the front of ksft_print_headers() as suggested
by David.
- Add reviewed by from Zi and Lorenzo
---
tools/testing/selftests/mm/transhuge-stress.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/mm/transhuge-stress.c b/tools/testing/selftests/mm/transhuge-stress.c
index bcad47c09518..7a9f1035099b 100644
--- a/tools/testing/selftests/mm/transhuge-stress.c
+++ b/tools/testing/selftests/mm/transhuge-stress.c
@@ -17,6 +17,7 @@
#include <sys/mman.h>
#include "vm_util.h"
#include "kselftest.h"
+#include "thp_settings.h"

int backing_fd = -1;
int mmap_flags = MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE;
@@ -37,6 +38,9 @@ int main(int argc, char **argv)

ksft_print_header();

+ if (!thp_is_enabled())
+ ksft_exit_skip("Transparent Hugepages not available\n");
+
ram = sysconf(_SC_PHYS_PAGES);
if (ram > SIZE_MAX / psize() / 4)
ram = SIZE_MAX / 4;
--
2.53.0