selftests/mm: hugetlb-madvise: add setup of HugeTLB pages

hugetlb-madvise test skips testing 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.

Link: https://lore.kernel.org/20260511162840.375890-39-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Tested-by: Luiz Capitulino <luizcap@redhat.com>
Tested-by: Sarthak Sharma <sarthak.sharma@arm.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Donet Tom <donettom@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Liam Howlett <liam@infradead.org>
Cc: Li Wang <li.wang@linux.dev>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/mm/hugetlb-madvise.c b/tools/testing/selftests/mm/hugetlb-madvise.c
index 8adcd91d078dff86d4e13d2c42aa9bbebd2fec01..555b4b3d14307e2ad9afe9b6bdfac6cef14f67b5 100644 (file)
--- a/tools/testing/selftests/mm/hugetlb-madvise.c
+++ b/tools/testing/selftests/mm/hugetlb-madvise.c
@@ -4,12 +4,6 @@
  *
  * Basic functional testing of madvise MADV_DONTNEED and MADV_REMOVE
  * on hugetlb mappings.
- *
- * Before running this test, make sure the administrator has pre-allocated
- * at least MIN_FREE_PAGES hugetlb pages and they are free.  In addition,
- * the test takes an argument that is the path to a file in a hugetlbfs
- * filesystem.  Therefore, a hugetlbfs filesystem must be mounted on some
- * directory.
  */
 
 #define _GNU_SOURCE
@@ -68,9 +62,9 @@ int main(int argc, char **argv)
        if (!base_page_size)
                ksft_exit_fail_msg("Unable to determine base page size\n");
 
+       if (!hugetlb_setup_default(MIN_FREE_PAGES))
+               ksft_exit_skip("Not enough free huge pages (have %lu, need %d)\n", hugetlb_free_default_pages(), MIN_FREE_PAGES);
        free_hugepages = hugetlb_free_default_pages();
-       if (free_hugepages < MIN_FREE_PAGES)
-               ksft_exit_skip("Not enough free huge pages (have %lu, need %d)\n", free_hugepages, MIN_FREE_PAGES);
 
        fd = memfd_create(argv[0], MFD_HUGETLB);
        if (fd < 0)