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

hugetlb-mmap 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.

Link: https://lore.kernel.org/20260511162840.375890-41-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Luiz Capitulino <luizcap@redhat.com>
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-mmap.c b/tools/testing/selftests/mm/hugetlb-mmap.c
index 395be5d0dc1a4e9fce65aafd161064473d483aca..0f2aad1b7dbd6fc570d9fa8ff54329064b4a715b 100644 (file)
--- a/tools/testing/selftests/mm/hugetlb-mmap.c
+++ b/tools/testing/selftests/mm/hugetlb-mmap.c
@@ -105,28 +105,35 @@ int main(int argc, char **argv)
 {
        size_t hugepage_size;
        size_t length = LENGTH;
-       int shift = 0;
+       int shift = 0, nr;
 
        ksft_print_header();
-       ksft_set_plan(2);
 
        if (argc > 1)
                length = atol(argv[1]) << 20;
        if (argc > 2)
                shift = atoi(argv[2]);
 
+       hugetlb_save_settings();
        if (shift) {
                hugepage_size = (1UL << shift);
                ksft_print_msg("%lu kB hugepages\n", 1UL << (shift - 10));
        } else {
                hugepage_size = default_huge_page_size();
+               if (!hugepage_size)
+                       ksft_exit_skip("Could not detect default hugetlb page size.");
                ksft_print_msg("Default size hugepages (%lu kB)\n", hugepage_size >> 10);
        }
 
        /* munmap will fail if the length is not page aligned */
-       if (hugepage_size > length)
-               length = hugepage_size;
+       length = (length + hugepage_size - 1) & ~(hugepage_size - 1);
+       nr = length / hugepage_size;
+
+       hugetlb_set_nr_pages(hugepage_size, nr);
+       if (hugetlb_free_pages(hugepage_size) < nr)
+               ksft_exit_skip("Not enough %lu Kb pages\n", hugepage_size >> 10);
 
+       ksft_set_plan(2);
        ksft_print_msg("Mapping %lu Mbytes\n", (unsigned long)length >> 20);
 
        test_anon_mmap(length, shift);