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rcutorture: Add interrupt-disable capability to stall-warning tests

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When rcutorture sees the rcutorture.stall_cpu kernel boot parameter,
it loops with preemption disabled, which does in fact normally
generate an RCU CPU stall warning message.  However, there are test
scenarios that need the stalling CPU to have interrupts disabled.
This commit therefore adds an rcutorture.stall_cpu_irqsoff kernel
boot parameter that causes the stalling CPU to disable interrupts.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2017-08-18 16:11:37 -07:00
parent 8a5776a5f4
commit 2b1516e55f
2 changed files with 16 additions and 5 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -3539,6 +3539,9 @@
rcutorture.stall_cpu_holdoff= [KNL]
Time to wait (s) after boot before inducing stall.
rcutorture.stall_cpu_irqsoff= [KNL]
Disable interrupts while stalling if set.
rcutorture.stat_interval= [KNL]
Time (s) between statistics printk()s.