2 files changed, 18 insertions, 0 deletions

diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index b8729eb09a5d..59c471de342a 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -203,6 +203,21 @@ static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
 extern int rcu_cpu_stall_suppress;
 int rcu_jiffies_till_stall_check(void);
 
+#define rcu_ftrace_dump_stall_suppress() \
+do { \
+        if (!rcu_cpu_stall_suppress) \
+                rcu_cpu_stall_suppress = 3; \
+} while (0)
+
+#define rcu_ftrace_dump_stall_unsuppress() \
+do { \
+        if (rcu_cpu_stall_suppress == 3) \
+                rcu_cpu_stall_suppress = 0; \
+} while (0)
+
+#else /* #endif #ifdef CONFIG_RCU_STALL_COMMON */
+#define rcu_ftrace_dump_stall_suppress()
+#define rcu_ftrace_dump_stall_unsuppress()
 #endif /* #ifdef CONFIG_RCU_STALL_COMMON */
 
 /*
@@ -222,7 +237,9 @@ do { \
         if (!atomic_read(&___rfd_beenhere) && \
             !atomic_xchg(&___rfd_beenhere, 1)) { \
                 tracing_off(); \
+                rcu_ftrace_dump_stall_suppress(); \
                 ftrace_dump(oops_dump_mode); \
+                rcu_ftrace_dump_stall_unsuppress(); \
         } \
 } while (0)
 
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 5033b66d2753..3dc8efb16dc7 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -494,6 +494,7 @@ EXPORT_SYMBOL_GPL(do_trace_rcu_torture_read);
 #endif
 
 int rcu_cpu_stall_suppress __read_mostly; /* 1 = suppress stall warnings. */
+EXPORT_SYMBOL_GPL(rcu_cpu_stall_suppress);
 static int rcu_cpu_stall_timeout __read_mostly = CONFIG_RCU_CPU_STALL_TIMEOUT;
 
 module_param(rcu_cpu_stall_suppress, int, 0644);