When running a kerenl with CONFIG_PREEMPT=n and CONFIG_RCU_STRICT_GRACE_PERIOD=y, the QS state will be reported directly after exiting the last level of RCU critical section and in non irqs-disable context, but maybe the CPU's rcu_data structure's ->cpu_no_qs.b.norm is not cleared, as a result the rcu_report_qs_rdp() will exit early, and not report QS state. This commit will clear CPU's rcu_data structure's ->cpu_no_qs.b.norm before invoke rcu_report_qs_rdp(). Signed-off-by: Zqiang <qiang1.zhang@xxxxxxxxx> --- kernel/rcu/tree_plugin.h | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index b2c01919b92c..dc78726b993f 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -824,6 +824,7 @@ void rcu_read_unlock_strict(void) if (irqs_disabled() || preempt_count() || !rcu_state.gp_kthread) return; rdp = this_cpu_ptr(&rcu_data); + rdp->cpu_no_qs.b.norm = false; rcu_report_qs_rdp(rdp); udelay(rcu_unlock_delay); } -- 2.25.1
