From: Mike Rapoport (Microsoft) <rppt@kernel.org>
Date: Mon, 11 May 2026 16:28:25 +0000 (+0300)
Subject: selftests/mm: hugetlb-mremap: add setup of HugeTLB pages
X-Git-Tag: v7.2-rc1~59^2~43
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a914785f6349da754e1226420bf4e51961956769;p=thirdparty%2Fkernel%2Flinux.git

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

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.

Link: https://lore.kernel.org/20260511162840.375890-42-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-mremap.c b/tools/testing/selftests/mm/hugetlb-mremap.c
index 1c87c39780c52..d239905790dd8 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 +127,16 @@ int main(int argc, char *argv[])
 	else
 		length = DEFAULT_LENGTH_MB;
 
+	hugepage_size = default_huge_page_size();
+	if (!hugepage_size)
+		ksft_exit_skip("Could not detect default hugetlb page size\n");
 	length = MB_TO_BYTES(length);
+	length = (length + hugepage_size - 1) & ~(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));