rcu: Warn on allegedly impossible rcu_read_unlock_special() from irq

After commit #10f39bb1b2c1 (rcu: protect __rcu_read_unlock() against
scheduler-using irq handlers), it is no longer possible to enter
the main body of rcu_read_lock_special() from an NMI, interrupt, or
softirq handler.  In theory, this implies that the check for "in_irq()
|| in_serving_softirq()" must always fail, so that in theory this check
could be removed entirely.

In practice, this commit wraps this condition with a WARN_ON_ONCE().
If this warning never triggers, then the condition will be removed
entirely.

[ paulmck: And one way of triggering the WARN_ON() is if a scheduling
  clock interrupt occurs in an RCU read-side critical section, setting
  RCU_READ_UNLOCK_NEED_QS, which is handled by rcu_read_unlock_special().
  Updated this commit to return if only that bit was set. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 752ffaa0d681..fa7a18b62253 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -361,10 +361,14 @@ void rcu_read_unlock_special(struct task_struct *t)
         special = t->rcu_read_unlock_special;
         if (special & RCU_READ_UNLOCK_NEED_QS) {
                 rcu_preempt_qs(smp_processor_id());
+                if (!t->rcu_read_unlock_special) {
+                        local_irq_restore(flags);
+                        return;
+                }
         }
 
-        /* Hardware IRQ handlers cannot block. */
-        if (in_irq() || in_serving_softirq()) {
+        /* Hardware IRQ handlers cannot block, complain if they get here. */
+        if (WARN_ON_ONCE(in_irq() || in_serving_softirq())) {
                 local_irq_restore(flags);
                 return;
         }