From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 24 Dec 2014 05:33:14 +0000 (-0800)
Subject: rcu: Initialize tiny RCU stall-warning timeouts at boot
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=630181c4a915edb0761bb282c567d3abc8ca2f35;p=linux-beck.git

rcu: Initialize tiny RCU stall-warning timeouts at boot

The current tiny RCU stall-warning code assumes that the jiffies counter
starts at zero, however, it is sometimes initialized to other values,
for example, -30,000.  This commit therefore changes rcu_init() to
invoke reset_cpu_stall_ticks() for both flavors of RCU to initialize
the stall-warning times properly at boot.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index 0db5649f8817..fc0f2c07af3a 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -383,6 +383,8 @@ EXPORT_SYMBOL_GPL(call_rcu_bh);
 void __init rcu_init(void)
 {
 	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+	RCU_TRACE(reset_cpu_stall_ticks(&rcu_sched_ctrlblk));
+	RCU_TRACE(reset_cpu_stall_ticks(&rcu_bh_ctrlblk));
 
 	rcu_early_boot_tests();
 }