MIGRATE_PFN_SHIFT
pfn = *mig.src >> MIGRATE_PFN_SHIFT;
return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT);
return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
unsigned long spfn = *src >> MIGRATE_PFN_SHIFT;
flags = migrate->src[idx] & ((1UL << MIGRATE_PFN_SHIFT) - 1);
pfn = migrate->src[idx] >> MIGRATE_PFN_SHIFT;