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-rw-r--r--kernel/trace/trace.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 022def96d307..8c52f5de9384 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -975,6 +975,11 @@ static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
preempt_disable_notrace();
+ /*
+ * Have to open code "rcu_dereference_sched()" because the
+ * function graph tracer can be called when RCU is not
+ * "watching".
+ */
hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
if (ftrace_hash_empty(hash)) {
@@ -1022,6 +1027,11 @@ static inline int ftrace_graph_notrace_addr(unsigned long addr)
preempt_disable_notrace();
+ /*
+ * Have to open code "rcu_dereference_sched()" because the
+ * function graph tracer can be called when RCU is not
+ * "watching".
+ */
notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
!preemptible());