X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Fvmscan.c;h=0095533cdde963143f7988c048a110519cc50a31;hb=a49335cceab8afb6603152fcc3f7d3b6677366ca;hp=cfffe5098d538e6d54d1954c523d455924cbf7fc;hpb=b857c730d4e960d1876ff56ce5c4bd81ea9ff5ae;p=linux-2.6

diff --git a/mm/vmscan.c b/mm/vmscan.c
index cfffe5098d..0095533cdd 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -822,6 +822,8 @@ shrink_zone(struct zone *zone, struct scan_control *sc)
 	unsigned long nr_active;
 	unsigned long nr_inactive;
 
+	atomic_inc(&zone->reclaim_in_progress);
+
 	/*
 	 * Add one to `nr_to_scan' just to make sure that the kernel will
 	 * slowly sift through the active list.
@@ -861,6 +863,8 @@ shrink_zone(struct zone *zone, struct scan_control *sc)
 	}
 
 	throttle_vm_writeout();
+
+	atomic_dec(&zone->reclaim_in_progress);
 }
 
 /*
@@ -900,9 +904,7 @@ shrink_caches(struct zone **zones, struct scan_control *sc)
 		if (zone->all_unreclaimable && sc->priority != DEF_PRIORITY)
 			continue;	/* Let kswapd poll it */
 
-		atomic_inc(&zone->reclaim_in_progress);
 		shrink_zone(zone, sc);
-		atomic_dec(&zone->reclaim_in_progress);
 	}
 }
  
@@ -1358,14 +1360,13 @@ int zone_reclaim(struct zone *zone, unsigned int gfp_mask, unsigned int order)
 		sc.swap_cluster_max = SWAP_CLUSTER_MAX;
 
 	/* Don't reclaim the zone if there are other reclaimers active */
-	if (!atomic_inc_and_test(&zone->reclaim_in_progress))
+	if (atomic_read(&zone->reclaim_in_progress) > 0)
 		goto out;
 
 	shrink_zone(zone, &sc);
 	total_reclaimed = sc.nr_reclaimed;
 
  out:
-	atomic_dec(&zone->reclaim_in_progress);
 	return total_reclaimed;
 }
 
@@ -1375,6 +1376,9 @@ asmlinkage long sys_set_zone_reclaim(unsigned int node, unsigned int zone,
 	struct zone *z;
 	int i;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
 	if (node >= MAX_NUMNODES || !node_online(node))
 		return -EINVAL;