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Subject[PATCH] rcutorture: add random preemption
Add random preemption to help we to torture the preemptable rcu.

srcu_read_delay() also calls rcu_read_delay() for shorter delays.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 2e2726d..7c81d07 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -303,6 +303,10 @@ static void rcu_read_delay(struct rcu_random_state *rrsp)
mdelay(longdelay_ms);
if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us)))
udelay(shortdelay_us);
+#ifdef CONFIG_PREEMPT
+ if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000)))
+ preempt_schedule();
+#endif
}

static void rcu_torture_read_unlock(int idx) __releases(RCU)
@@ -536,6 +540,8 @@ static void srcu_read_delay(struct rcu_random_state *rrsp)
delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick);
if (!delay)
schedule_timeout_interruptible(longdelay);
+ else
+ rcu_read_delay(rrsp);
}

static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl)

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