Merge "rcu: Induce msm watchdog bite for rcu stalls" (b7207bf0) · Commits · e / devices / android_kernel_sony_msm8998

kernel/rcu/tree.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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.
		*

+11 −0

Original line number	Diff line number	Diff line
		@@ -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