SWP_PAGE_DISCARD
if (si->flags & SWP_PAGE_DISCARD) {
if (!(si->flags & SWP_PAGE_DISCARD)) {
if (si->flags & SWP_PAGE_DISCARD)
SWP_PAGE_DISCARD);
si->flags &= ~SWP_PAGE_DISCARD;
(si->flags & SWP_PAGE_DISCARD) ? "c" : "");
if ((si->flags & (SWP_WRITEOK | SWP_PAGE_DISCARD)) ==
(SWP_WRITEOK | SWP_PAGE_DISCARD)) {