[PATCH v3 40/54] selftests/mm: hugetlb-mremap: add setup of HugeTLB pages

Mike Rapoport
2026-04-28T20:47:14Z

hugetlb-mremap test fails if there are no free huge pages prepared by a
wrapper script.

Add setup of HugeTLB pages to the test and make sure that the original
settings are restored on the test exit.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
tools/testing/selftests/mm/hugetlb-mremap.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/hugetlb-mremap.c b/tools/testing/selftests/mm/hugetlb-mremap.c
index 1c87c39780c5..09241a279ec2 100644
--- a/tools/testing/selftests/mm/hugetlb-mremap.c
+++ b/tools/testing/selftests/mm/hugetlb-mremap.c
@@ -26,6 +26,7 @@
#include <stdbool.h>
#include "kselftest.h"
#include "vm_util.h"
+#include "hugepage_settings.h"

#define DEFAULT_LENGTH_MB 10UL
#define MB_TO_BYTES(x) (x * 1024 * 1024)
@@ -108,8 +109,9 @@ static void register_region_with_uffd(char *addr, size_t len)

int main(int argc, char *argv[])
{
+ unsigned long hugepage_size;
+ int ret = 0, fd, nr;
size_t length = 0;
- int ret = 0, fd;

ksft_print_header();
ksft_set_plan(1);
@@ -125,7 +127,14 @@ int main(int argc, char *argv[])
else
length = DEFAULT_LENGTH_MB;

+ hugepage_size = default_huge_page_size();
length = MB_TO_BYTES(length);
+ length = (length + hugepage_size) & ~(hugepage_size - 1);
+ nr = length / hugepage_size;
+
+ if (!hugetlb_setup_default(nr))
+ ksft_exit_skip("Not enough huge pages\n");
+
fd = memfd_create(argv[0], MFD_HUGETLB);
if (fd < 0)
ksft_exit_fail_msg("Open failed: %s\n", strerror(errno));
--
2.53.0