+ selftests-mm-transhuge_stress-skip-the-test-when-thp-not-available.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: selftests/mm: transhuge_stress: skip the test when thp not available
has been added to the -mm mm-unstable branch.  Its filename is
     selftests-mm-transhuge_stress-skip-the-test-when-thp-not-available.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-transhuge_stress-skip-the-test-when-thp-not-available.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Chunyu Hu <chuhu@redhat.com>
Subject: selftests/mm: transhuge_stress: skip the test when thp not available
Date: Thu, 2 Apr 2026 09:45:43 +0800

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

Link: https://lkml.kernel.org/r/20260402014543.1671131-7-chuhu@redhat.com
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
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: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/transhuge-stress.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/tools/testing/selftests/mm/transhuge-stress.c~selftests-mm-transhuge_stress-skip-the-test-when-thp-not-available
+++ a/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;
_

Patches currently in -mm which might be from chuhu@redhat.com are

selftests-mm-guard-regions-skip-collapse-test-when-thp-not-enabled.patch
selftests-mm-soft-dirty-skip-two-tests-when-thp-is-not-available.patch
selftests-mm-move-write_file-helper-to-vm_util.patch
selftests-mm-vm_util-robust-write_file.patch
selftests-mm-split_huge_page_test-skip-the-test-when-thp-is-not-available.patch
selftests-mm-transhuge_stress-skip-the-test-when-thp-not-available.patch