PG_dcache_cpu_shift
(((folio)->flags.f >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift);
mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty);
"i" (PG_dcache_cpu_shift)
int cpu = ((pg_flags >> PG_dcache_cpu_shift) &