From: Zqiang <qiang.zh...@linux.dev>
The per-CPU rcu_data structure's ->defer_qs_iw field is initialized
by IRQ_WORK_INIT_HARD(), which means that the subsequent invocation of
rcu_preempt_deferred_qs_handler() will always be executed with interrupts
disabled. This commit therefore removes the local_irq_save/restore()
operations from rcu_preempt_deferred_qs_handler() and adds a call to
lockdep_assert_irqs_disabled() in order to enable lockdep to diagnose
mistaken invocations of this function from interrupts-enabled code.
Signed-off-by: Zqiang <qiang.zh...@linux.dev>
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
---
kernel/rcu/tree_plugin.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 4cd170b2d6551d..d85763336b3c0f 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -626,11 +626,10 @@ notrace void rcu_preempt_deferred_qs(struct task_struct
*t)
*/
static void rcu_preempt_deferred_qs_handler(struct irq_work *iwp)
{
- unsigned long flags;
struct rcu_data *rdp;
+ lockdep_assert_irqs_disabled();
rdp = container_of(iwp, struct rcu_data, defer_qs_iw);
- local_irq_save(flags);
/*
* If the IRQ work handler happens to run in the middle of RCU read-side
@@ -647,8 +646,6 @@ static void rcu_preempt_deferred_qs_handler(struct irq_work
*iwp)
*/
if (rcu_preempt_depth() > 0)
WRITE_ONCE(rdp->defer_qs_iw_pending, DEFER_QS_IDLE);
-
- local_irq_restore(flags);
}
/*
--
2.40.1
