-/*
- * Try to acquire the oom killer lock for all system zones. Returns zero if a
- * parallel oom killing is taking place, otherwise locks all zones and returns
- * non-zero.
- */
-static int try_set_system_oom(void)
-{
- struct zone *zone;
- int ret = 1;
-
- spin_lock(&zone_scan_lock);
- for_each_populated_zone(zone)
- if (zone_is_oom_locked(zone)) {
- ret = 0;
- goto out;
- }
- for_each_populated_zone(zone)
- zone_set_flag(zone, ZONE_OOM_LOCKED);
-out:
- spin_unlock(&zone_scan_lock);
- return ret;
-}
-
-/*
- * Clears ZONE_OOM_LOCKED for all system zones so that failed allocation
- * attempts or page faults may now recall the oom killer, if necessary.
- */
-static void clear_system_oom(void)
-{
- struct zone *zone;
-
- spin_lock(&zone_scan_lock);
- for_each_populated_zone(zone)
- zone_clear_flag(zone, ZONE_OOM_LOCKED);
- spin_unlock(&zone_scan_lock);
-}
-