From: Mike Rapoport (Microsoft) <rppt@kernel.org>
Date: Mon, 11 May 2026 16:28:24 +0000 (+0300)
Subject: selftests/mm: hugetlb-mmap: add setup of HugeTLB pages
X-Git-Tag: v7.2-rc1~59^2~44
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae571cd6015c6ebb023a4b9ccd49125b7cf93610;p=thirdparty%2Fkernel%2Flinux.git

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 395be5d0dc1a4..0f2aad1b7dbd6 100644
--- 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);