Currently, rcu_report_dead() disables preemption across its call to rcu_report_exp_rdp(), but this is pointless because interrupts are already disabled by the caller. In addition, rcu_report_dead() computes the address of the outgoing CPU's rcu_data structure, which is also pointless because this address is already present in local variable rdp. This commit therefore drops the preemption disabling and passes rdp to rcu_report_exp_rdp(). Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> --- kernel/rcu/tree.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 801075e36515..dc2968473593 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4294,9 +4294,7 @@ void rcu_report_dead(unsigned int cpu) do_nocb_deferred_wakeup(rdp); /* QS for any half-done expedited grace period. */ - preempt_disable(); - rcu_report_exp_rdp(this_cpu_ptr(&rcu_data)); - preempt_enable(); + rcu_report_exp_rdp(rdp); rcu_preempt_deferred_qs(current); /* Remove outgoing CPU from mask in the leaf rcu_node structure. */ -- 2.31.1.189.g2e36527f23
