s390/mm: Clear skeys for newly mapped huge guest pmds
Similarly to the pte skey handling, where we set the storage key to the default key for each newly mapped pte, we have to also do that for huge pmds. With the PG_arch_1 flag we keep track if the area has already been cleared of its skeys. Signed-off-by: NJanosch Frank <frankja@linux.ibm.com> Reviewed-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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