TK_CLOCK_WAS_SET
timekeeping_update_from_shadow(&tk_core, TK_CLOCK_WAS_SET);
timekeeping_update_from_shadow(&tk_core, TK_CLOCK_WAS_SET);
clock_set = TK_CLOCK_WAS_SET;
timekeeping_update_from_shadow(tkd, TK_CLOCK_WAS_SET);
#define TK_UPDATE_ALL (TK_CLEAR_NTP | TK_CLOCK_WAS_SET)
update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
if (action & TK_CLOCK_WAS_SET)