SWAPPINESS_ANON_ONLY
if (swappiness == SWAPPINESS_ANON_ONLY) {
#define max_type(swappiness) ((swappiness) < SWAPPINESS_ANON_ONLY)
if (type && (swappiness == SWAPPINESS_ANON_ONLY))
else if (swappiness > SWAPPINESS_ANON_ONLY)
swappiness = SWAPPINESS_ANON_ONLY;
swappiness = SWAPPINESS_ANON_ONLY;