s390x/tcg: use s390_program_interrupt() in SCLP Service Call
Now we can drop potential_page_fault(). While at it, move the unlock further up, looks cleaner. Signed-off-by: NDavid Hildenbrand <david@redhat.com> Message-Id: <20171130162744.25442-11-david@redhat.com> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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