oom: move constraints to enum

The OOM killer's CONSTRAINT definitions are really more appropriate in an
enum, so define them in include/linux/oom.h.

Cc: Andrea Arcangeli <andrea@suse.de>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 12 insertions, 9 deletions

diff --git a/include/linux/oom.h b/include/linux/oom.h
index b40bb4e32c2f..cf6ebf5b422c 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -11,6 +11,15 @@
 
 #ifdef __KERNEL__
 
+/*
+ * Types of limitations to the nodes from which allocations may occur
+ */
+enum oom_constraint {
+        CONSTRAINT_NONE,
+        CONSTRAINT_CPUSET,
+        CONSTRAINT_MEMORY_POLICY,
+};
+
 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order);
 extern int register_oom_notifier(struct notifier_block *nb);
 extern int unregister_oom_notifier(struct notifier_block *nb);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 41b4e362221d..1a7a4ef04e27 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -164,16 +164,10 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
 }
 
 /*
- * Types of limitations to the nodes from which allocations may occur
- */
-#define CONSTRAINT_NONE 1
-#define CONSTRAINT_MEMORY_POLICY 2
-#define CONSTRAINT_CPUSET 3
-
-/*
  * Determine the type of allocation constraint.
  */
-static inline int constrained_alloc(struct zonelist *zonelist, gfp_t gfp_mask)
+static inline enum oom_constraint constrained_alloc(struct zonelist *zonelist,
+                                                    gfp_t gfp_mask)
 {
 #ifdef CONFIG_NUMA
         struct zone **z;
@@ -393,7 +387,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order)
         struct task_struct *p;
         unsigned long points = 0;
         unsigned long freed = 0;
-        int constraint;
+        enum oom_constraint constraint;
 
         blocking_notifier_call_chain(&oom_notify_list, 0, &freed);
         if (freed > 0)