3 files changed, 18 insertions, 22 deletions

diff --git a/include/linux/oom.h b/include/linux/oom.h
index 4cd62677feb9..647395a1a550 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -55,8 +55,8 @@ extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
                              struct mem_cgroup *memcg, nodemask_t *nodemask,
                              const char *message);
 
-extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
-extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
+extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags);
+extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags);
 
 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
                                int order, const nodemask_t *nodemask);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index b0a1e1ff0353..d33aca1552ad 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -559,28 +559,25 @@ EXPORT_SYMBOL_GPL(unregister_oom_notifier);
  * if a parallel OOM killing is already taking place that includes a zone in
  * the zonelist.  Otherwise, locks all zones in the zonelist and returns 1.
  */
-int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_mask)
+bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_mask)
 {
         struct zoneref *z;
         struct zone *zone;
-        int ret = 1;
+        bool ret = true;
 
         spin_lock(&zone_scan_lock);
-        for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
+        for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask))
                 if (zone_is_oom_locked(zone)) {
-                        ret = 0;
+                        ret = false;
                         goto out;
                 }
-        }
 
-        for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
-                /*
-                 * Lock each zone in the zonelist under zone_scan_lock so a
-                 * parallel invocation of try_set_zonelist_oom() doesn't succeed
-                 * when it shouldn't.
-                 */
+        /*
+         * Lock each zone in the zonelist under zone_scan_lock so a parallel
+         * call to oom_zonelist_trylock() doesn't succeed when it shouldn't.
+         */
+        for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask))
                 zone_set_flag(zone, ZONE_OOM_LOCKED);
-        }
 
 out:
         spin_unlock(&zone_scan_lock);
@@ -592,15 +589,14 @@ out:
  * allocation attempts with zonelists containing them may now recall the OOM
  * killer, if necessary.
  */
-void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_mask)
+void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_mask)
 {
         struct zoneref *z;
         struct zone *zone;
 
         spin_lock(&zone_scan_lock);
-        for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
+        for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask))
                 zone_clear_flag(zone, ZONE_OOM_LOCKED);
-        }
         spin_unlock(&zone_scan_lock);
 }
 
@@ -695,8 +691,8 @@ void pagefault_out_of_memory(void)
                 return;
 
         zonelist = node_zonelist(first_memory_node, GFP_KERNEL);
-        if (try_set_zonelist_oom(zonelist, GFP_KERNEL)) {
+        if (oom_zonelist_trylock(zonelist, GFP_KERNEL)) {
                 out_of_memory(NULL, 0, 0, NULL, false);
-                clear_zonelist_oom(zonelist, GFP_KERNEL);
+                oom_zonelist_unlock(zonelist, GFP_KERNEL);
         }
 }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fb9908148474..578236089ec1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2246,8 +2246,8 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
 {
         struct page *page;
 
-        /* Acquire the OOM killer lock for the zones in zonelist */
-        if (!try_set_zonelist_oom(zonelist, gfp_mask)) {
+        /* Acquire the per-zone oom lock for each zone */
+        if (!oom_zonelist_trylock(zonelist, gfp_mask)) {
                 schedule_timeout_uninterruptible(1);
                 return NULL;
         }
@@ -2285,7 +2285,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
         out_of_memory(zonelist, gfp_mask, order, nodemask, false);
 
 out:
-        clear_zonelist_oom(zonelist, gfp_mask);
+        oom_zonelist_unlock(zonelist, gfp_mask);
         return page;
 }