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-rw-r--r--kernel/rcutree.c2
-rw-r--r--kernel/rcutree.h6
-rw-r--r--lib/Kconfig.debug13
3 files changed, 20 insertions, 1 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 5d910beefff..5aab7dabd0d 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -144,7 +144,7 @@ module_param(qhimark, int, 0);
module_param(qlowmark, int, 0);
#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
-int rcu_cpu_stall_suppress __read_mostly;
+int rcu_cpu_stall_suppress __read_mostly = RCU_CPU_STALL_SUPPRESS_INIT;
module_param(rcu_cpu_stall_suppress, int, 0644);
#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 183ebf40531..bb4d08695c4 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -264,6 +264,12 @@ struct rcu_data {
/* scheduling clock irq */
/* before ratting on them. */
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR_RUNNABLE
+#define RCU_CPU_STALL_SUPPRESS_INIT 0
+#else
+#define RCU_CPU_STALL_SUPPRESS_INIT 1
+#endif
+
#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
#define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b))
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index b5005b76210..52c2172dff1 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -856,6 +856,19 @@ config RCU_CPU_STALL_TIMEOUT
RCU grace period persists, additional CPU stall warnings are
printed at more widely spaced intervals.
+config RCU_CPU_STALL_DETECTOR_RUNNABLE
+ bool "RCU CPU stall checking starts automatically at boot"
+ depends on RCU_CPU_STALL_DETECTOR
+ default y
+ help
+ If set, start checking for RCU CPU stalls immediately on
+ boot. Otherwise, RCU CPU stall checking must be manually
+ enabled.
+
+ Say Y if you are unsure.
+
+ Say N if you wish to suppress RCU CPU stall checking during boot.
+
config RCU_CPU_STALL_VERBOSE
bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR"
depends on RCU_CPU_STALL_DETECTOR && TREE_PREEMPT_RCU