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-rw-r--r--include/trace/events/kmem.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index 78efa0a197a9..aa863549e77a 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -158,12 +158,24 @@ DEFINE_EVENT_CONDITION(kmem_free, kmem_cache_free,
TP_CONDITION(cpu_online(raw_smp_processor_id()))
);
-TRACE_EVENT(mm_page_free,
+TRACE_EVENT_CONDITION(mm_page_free,
TP_PROTO(struct page *page, unsigned int order),
TP_ARGS(page, order),
+
+ /*
+ * This trace can be potentially called from an offlined cpu.
+ * Since trace points use RCU and RCU should not be used from
+ * offline cpus, filter such calls out.
+ * While this trace can be called from a preemptable section,
+ * it has no impact on the condition since tasks can migrate
+ * only from online cpus to other online cpus. Thus its safe
+ * to use raw_smp_processor_id.
+ */
+ TP_CONDITION(cpu_online(raw_smp_processor_id())),
+
TP_STRUCT__entry(
__field( unsigned long, pfn )
__field( unsigned int, order )