linux-kernel - Re: [PATCH] rcu: in

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Date:   Tue, 28 Sep 2021 14:03:57 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Josh Triplett <josh@...htriplett.org>, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: in_irq() cleanup

On Tue, Sep 28, 2021 at 08:21:28AM +0800, Changbin Du wrote:
> Replace the obsolete and ambiguos macro in_irq() with new
> macro in_hardirq().
> 
> Signed-off-by: Changbin Du <changbin.du@...il.com>

Queued for v5.17 (merge window after next), thank you!

							Thanx, Paul

> ---
>  include/linux/rcutiny.h  | 2 +-
>  kernel/rcu/tree.c        | 2 +-
>  kernel/rcu/tree_plugin.h | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
> index 9be015305f9f..858f4d429946 100644
> --- a/include/linux/rcutiny.h
> +++ b/include/linux/rcutiny.h
> @@ -85,7 +85,7 @@ static inline void rcu_irq_enter_irqson(void) { }
>  static inline void rcu_irq_exit(void) { }
>  static inline void rcu_irq_exit_check_preempt(void) { }
>  #define rcu_is_idle_cpu(cpu) \
> -	(is_idle_task(current) && !in_nmi() && !in_irq() && !in_serving_softirq())
> +	(is_idle_task(current) && !in_nmi() && !in_hardirq() && !in_serving_softirq())
>  static inline void exit_rcu(void) { }
>  static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
>  {
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index bce848e50512..b53dd00975ab 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -1471,7 +1471,7 @@ static void rcu_gp_kthread_wake(void)
>  {
>  	struct task_struct *t = READ_ONCE(rcu_state.gp_kthread);
>  
> -	if ((current == t && !in_irq() && !in_serving_softirq()) ||
> +	if ((current == t && !in_hardirq() && !in_serving_softirq()) ||
>  	    !READ_ONCE(rcu_state.gp_flags) || !t)
>  		return;
>  	WRITE_ONCE(rcu_state.gp_wake_time, jiffies);
> diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
> index d070059163d7..727bf14c9a63 100644
> --- a/kernel/rcu/tree_plugin.h
> +++ b/kernel/rcu/tree_plugin.h
> @@ -642,7 +642,7 @@ static void rcu_read_unlock_special(struct task_struct *t)
>  			   (IS_ENABLED(CONFIG_RCU_BOOST) && irqs_were_disabled &&
>  			    t->rcu_blocked_node);
>  		// Need to defer quiescent state until everything is enabled.
> -		if (use_softirq && (in_irq() || (expboost && !irqs_were_disabled))) {
> +		if (use_softirq && (in_hardirq() || (expboost && !irqs_were_disabled))) {
>  			// Using softirq, safe to awaken, and either the
>  			// wakeup is free or there is either an expedited
>  			// GP in flight or a potential need to deboost.
> -- 
> 2.32.0
>