selftests/vm: use memfd for hugepage-mremap test
For dropping the hugetlb mountpoint in run_vmtests.sh. Cleaned it up a little bit around the changed codes. Link: https://lkml.kernel.org/r/20221014144013.94027-1-peterx@redhat.comSigned-off-by: Peter Xu <peterx@redhat.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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