CALLOUT_DFRMIGRATION
c->c_iflags |= (CALLOUT_DFRMIGRATION | CALLOUT_PENDING);
if ((c->c_iflags & (CALLOUT_DFRMIGRATION | CALLOUT_PENDING)) ==
(CALLOUT_DFRMIGRATION | CALLOUT_PENDING) &&
c->c_iflags &= ~CALLOUT_DFRMIGRATION;
c->c_iflags &= ~CALLOUT_DFRMIGRATION;
#define callout_migrating(c) ((c)->c_iflags & CALLOUT_DFRMIGRATION)
c->c_iflags &= ~CALLOUT_DFRMIGRATION;
c->c_iflags &= ~CALLOUT_DFRMIGRATION;