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rcu: Make expedited RCU CPU stall warnings respond to controls 

The expedited RCU CPU stall warnings currently responds to neither the
panic_on_rcu_stall sysctl setting nor the rcupdate.rcu_cpu_stall_suppress
kernel boot parameter.  This commit therefore updates the expedited code
to respond to these two controls.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2016-06-29 14:49:29 -07:00
parent 908d2c1fd1
commit 24a6cff286
1 changed files with 3 additions and 0 deletions
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3
kernel/rcu/tree_exp.h
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@ -428,6 +428,9 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
if (ret > 0 || sync_rcu_preempt_exp_done(rnp_root))
return;
WARN_ON(ret < 0); /* workqueues should not be signaled. */
if (rcu_cpu_stall_suppress)
continue;
panic_on_rcu_stall();
pr_err("INFO: %s detected expedited stalls on CPUs/tasks: {",
rsp->name);
ndetected = 0;