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[PATCH tip/core/rcu 07/13] rcutorture: Enable SRCU readers from timer handler

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Now that it is legal to invoke srcu_read_lock() and srcu_read_unlock()
for a given srcu_struct from both process context and {soft,}irq
handlers, it is time to test it.  This commit therefore enables
testing of SRCU readers from rcutorture's timer handler, using in_task()
to determine whether or not it is safe to sleep in the SRCU read-side
critical sections.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 kernel/rcu/rcutorture.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index aedc8f2ad955..8d59c82bec0b 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -522,7 +522,7 @@ static void srcu_read_delay(struct torture_random_state *rrsp)
 
 	delay = torture_random(rrsp) %
 		(nrealreaders * 2 * longdelay * uspertick);
-	if (!delay)
+	if (!delay && in_task())
 		schedule_timeout_interruptible(longdelay);
 	else
 		rcu_read_delay(rrsp);
@@ -583,6 +583,7 @@ static struct rcu_torture_ops srcu_ops = {
 	.call		= srcu_torture_call,
 	.cb_barrier	= srcu_torture_barrier,
 	.stats		= srcu_torture_stats,
+	.irq_capable	= 1,
 	.name		= "srcu"
 };
 
@@ -615,6 +616,7 @@ static struct rcu_torture_ops srcud_ops = {
 	.call		= srcu_torture_call,
 	.cb_barrier	= srcu_torture_barrier,
 	.stats		= srcu_torture_stats,
+	.irq_capable	= 1,
 	.name		= "srcud"
 };
 
-- 
2.5.2

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[PATCH tip/core/rcu 0/13] Torture-test updates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 09/13] rcutorture: Use nr_cpus rather than maxcpus to limit test size "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 11/13] rcutorture: Eliminate unused ts_rem local from rcu_trace_clock_local() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 12/13] rcu: Add last-CPU to GP-kthread starvation messages "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 13/13] rcutorture: Invoke call_rcu() from timer handler "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 06/13] rcutorture: Don't wait for kernel when all builds fail "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 05/13] torture: Add --kconfig argument to kvm.sh "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 07/13] rcutorture: Enable SRCU readers from timer handler "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 01/13] rcutorture: Move SRCU status printing to SRCU implementations "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 08/13] rcutorture: Place event-traced strings into trace buffer "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 02/13] rcutorture: Print SRCU lock/unlock totals "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200

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