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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-12-23 21:33:14 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-01-15 23:33:17 -0800
commit630181c4a915edb0761bb282c567d3abc8ca2f35 (patch)
tree0d2c62ef2866b5e913a0a7aff9c1d6477fca2ac9
parentec1fe396ff42e240c9b32111ee53665c5916fe5e (diff)
downloadlwn-630181c4a915edb0761bb282c567d3abc8ca2f35.tar.gz
lwn-630181c4a915edb0761bb282c567d3abc8ca2f35.zip
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>
-rw-r--r--kernel/rcu/tiny.c2
1 files changed, 2 insertions, 0 deletions
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();
}