diff options
| -rw-r--r-- | kernel/rcu/tree.c | 12 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 11 |
2 files changed, 23 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index f07343b54fe5..2cb46d51d715 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -57,6 +57,8 @@ #include <linux/trace_events.h> #include <linux/suspend.h> +#include <soc/qcom/watchdog.h> + #include "tree.h" #include "rcu.h" @@ -1298,6 +1300,11 @@ static void print_other_cpu_stall(struct rcu_state *rsp, unsigned long gpnum) rcu_check_gp_kthread_starvation(rsp); +#ifdef CONFIG_RCU_STALL_WATCHDOG_BITE + /* Induce watchdog bite */ + msm_trigger_wdog_bite(); +#endif + force_quiescent_state(rsp); /* Kick them all. */ } @@ -1333,6 +1340,11 @@ static void print_cpu_stall(struct rcu_state *rsp) jiffies + 3 * rcu_jiffies_till_stall_check() + 3); raw_spin_unlock_irqrestore(&rnp->lock, flags); +#ifdef CONFIG_RCU_STALL_WATCHDOG_BITE + /* Induce non secure watchdog bite to collect context */ + msm_trigger_wdog_bite(); +#endif + /* * Attempt to revive the RCU machinery by forcing a context switch. * diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 902657d4cac5..3cd6011f209d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1455,6 +1455,17 @@ config RCU_CPU_STALL_TIMEOUT RCU grace period persists, additional CPU stall warnings are printed at more widely spaced intervals. +config RCU_STALL_WATCHDOG_BITE + bool "RCU stall induce watchdog bite" + depends on RCU_STALL_COMMON && QCOM_WATCHDOG_V2 + help + Induce watchdog bite if RCU grace period extends more than + specified no of seconds instead of just warning messages. + This helps to collect ram dumps and cpu context for + postmortem analysis. Generally if a given RCU grace period + extends more than the specified number of seconds, + a CPU stall warning is printed. + config RCU_TRACE bool "Enable tracing for RCU" depends on DEBUG_KERNEL |