Re: [RFC PATCH 48/86] rcu: handle quiescent states for PREEMPT_RCU=n
From: Steven Rostedt
Date: Wed Dec 06 2023 - 21:10:01 EST
On Wed, 06 Dec 2023 17:31:30 -0800
Ankur Arora <ankur.a.arora@xxxxxxxxxx> wrote:
> ---
> diff --git a/include/linux/preempt.h b/include/linux/preempt.h
> index 9aa6358a1a16..d8139cda8814 100644
> --- a/include/linux/preempt.h
> +++ b/include/linux/preempt.h
> @@ -226,9 +226,11 @@ do { \
> #ifdef CONFIG_PREEMPTION
> #define preempt_enable() \
> do { \
> barrier(); \
> if (unlikely(preempt_count_dec_and_test())) \
> __preempt_schedule(); \
> + else if (unlikely(raw_cpu_read(rcu_data.rcu_urgent_qs))) \
Shouldn't this still have the:
else if (!IS_ENABLED(CONFIG_PREEMPT_RCU) && \
That is, is it needed when PREEMPT_RCU is set?
-- Steve
> + rcu_all_qs_check();
> } while (0)
>
> #define preempt_enable_notrace() \