rcu: Remove local_irq_save/restore() in rcu_preempt_deferred_qs_handler()

Browse source

[ Upstream commit 42d590d100 ]

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.zhang@linux.dev>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Stable-dep-of: d41e37f26b ("rcu: Fix rcu_read_unlock() deadloop due to softirq")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Zqiang 2025-08-13 21:30:02 +08:00 • committed by Sasha Levin

parent 24d44e0f05

commit 586a5effe5

1 changed files with 1 additions and 4 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

5

kernel/rcu/tree_plugin.h

View file