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-rw-r--r--mm/compaction.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 640fa76228dd..262c4676b32c 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1981,9 +1981,21 @@ static inline bool is_via_compact_memory(int order)
return order == -1;
}
+/*
+ * Determine whether kswapd is (or recently was!) running on this node.
+ *
+ * pgdat_kswapd_lock() pins pgdat->kswapd, so a concurrent kswapd_stop() can't
+ * zero it.
+ */
static bool kswapd_is_running(pg_data_t *pgdat)
{
- return pgdat->kswapd && task_is_running(pgdat->kswapd);
+ bool running;
+
+ pgdat_kswapd_lock(pgdat);
+ running = pgdat->kswapd && task_is_running(pgdat->kswapd);
+ pgdat_kswapd_unlock(pgdat);
+
+ return running;
}
/*