media: video: tegra: sh532u: fix out-of-bounds read
[linux-2.6.git] / mm / vmscan.c
index f87702a..b55699c 100644 (file)
@@ -1794,23 +1794,15 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
        u64 fraction[2], denominator;
        enum lru_list l;
        int noswap = 0;
-       int force_scan = 0;
+       bool force_scan = false;
        unsigned long nr_force_scan[2];
 
-
-       anon  = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
-               zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
-       file  = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_FILE) +
-               zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
-
-       if (((anon + file) >> priority) < SWAP_CLUSTER_MAX) {
-               /* kswapd does zone balancing and need to scan this zone */
-               if (scanning_global_lru(sc) && current_is_kswapd())
-                       force_scan = 1;
-               /* memcg may have small limit and need to avoid priority drop */
-               if (!scanning_global_lru(sc))
-                       force_scan = 1;
-       }
+       /* kswapd does zone balancing and needs to scan this zone */
+       if (scanning_global_lru(sc) && current_is_kswapd())
+               force_scan = true;
+       /* memcg may have small limit and need to avoid priority drop */
+       if (!scanning_global_lru(sc))
+               force_scan = true;
 
        /* If we have no swap space, do not bother scanning anon pages. */
        if (!sc->may_swap || (nr_swap_pages <= 0)) {
@@ -1823,6 +1815,11 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
                goto out;
        }
 
+       anon  = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
+               zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
+       file  = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_FILE) +
+               zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+
        if (scanning_global_lru(sc)) {
                free  = zone_page_state(zone, NR_FREE_PAGES);
                /* If we have very few page cache pages,
@@ -2500,6 +2497,9 @@ loop_again:
                                        high_wmark_pages(zone), 0, 0)) {
                                end_zone = i;
                                break;
+                       } else {
+                               /* If balanced, clear the congested flag */
+                               zone_clear_flag(zone, ZONE_CONGESTED);
                        }
                }
                if (i < 0)