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When building the PDX test harness as a 32bit executable the page shifts
done on unsigned long types can overflow. Instead use pfn_to_paddr(),
which casts the values to paddr_t previous to doing the shift.
Fixes: cb50e40337 ("test/pdx: add PDX compression unit tests")
Reported-by: Edwin Török <edwin.torok@citrix.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>