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rcu: Warn on allegedly impossible rcu_read_unlock_special() from irq

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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>
This commit is contained in:
Lai Jiangshan 2013-10-30 04:13:22 -07:00 committed by Paul E. McKenney
parent 24ef659a85
commit 79a62f957e
1 changed files with 6 additions and 2 deletions
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8
kernel/rcu/tree_plugin.h
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@ -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;
}