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Unlike the existing tests, this new test will create a memfd (backed by hugetlb) and pin the folios in it (a small subset) before writing/ populating it with data. This is a valid use-case that invokes the memfd_alloc_folio() kernel API and is expected to work unless there aren't enough hugetlb folios to satisfy the allocation needs. Link: https://lkml.kernel.org/r/20250618053415.1036185-4-vivek.kasireddy@intel.com Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Steve Sistare <steven.sistare@oracle.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: David Hildenbrand <david@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>