1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 0e38a1deeb23..6ecb6dc2f303 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -24,6 +24,7 @@ extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
                         int order, gfp_t gfp_mask, nodemask_t *mask,
                         bool sync, bool *contended, struct page **page);
 extern int compact_pgdat(pg_data_t *pgdat, int order);
+extern void reset_isolation_suitable(pg_data_t *pgdat);
 extern unsigned long compaction_suitable(struct zone *zone, int order);
 
 /* Do not skip compaction more than 64 times */
@@ -61,6 +62,16 @@ static inline bool compaction_deferred(struct zone *zone, int order)
         return zone->compact_considered < defer_limit;
 }
 
+/* Returns true if restarting compaction after many failures */
+static inline bool compaction_restarting(struct zone *zone, int order)
+{
+        if (order < zone->compact_order_failed)
+                return false;
+
+        return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT &&
+                zone->compact_considered >= 1UL << zone->compact_defer_shift;
+}
+
 #else
 static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
                         int order, gfp_t gfp_mask, nodemask_t *nodemask,
@@ -74,6 +85,10 @@ static inline int compact_pgdat(pg_data_t *pgdat, int order)
         return COMPACT_CONTINUE;
 }
 
+static inline void reset_isolation_suitable(pg_data_t *pgdat)
+{
+}
+
 static inline unsigned long compaction_suitable(struct zone *zone, int order)
 {
         return COMPACT_SKIPPED;