linux-kernel - Re: [PATCH] cpu/hotplug: get rid of CPU

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Message-Id: <20160817142211.GB3482@linux.vnet.ibm.com>
Date:	Wed, 17 Aug 2016 07:22:11 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpu/hotplug: get rid of CPU_STARTING reference

On Wed, Aug 17, 2016 at 02:21:04PM +0200, Sebastian Andrzej Siewior wrote:
> CPU_STARTING is scheduled for removal. There is no use of it in drivers
> and just compatibility use core code. This patch removes it from an RCU
> related comment.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Queued, thank you!

							Thanx, Paul

> ---
> 
> Paul, this "CPU_STARTING" refrences got in via "rcu: Exact CPU-online
> tracking for RCU".
> 
>  kernel/cpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index 35b53a1f56a7..3788ad9d4073 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -897,7 +897,7 @@ void notify_cpu_starting(unsigned int cpu)
>  	struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu);
>  	enum cpuhp_state target = min((int)st->target, CPUHP_AP_ONLINE);
> 
> -	rcu_cpu_starting(cpu);  /* All CPU_STARTING notifiers can use RCU. */
> +	rcu_cpu_starting(cpu);	/* Enables RCU usage on this CPU. */
>  	while (st->state < target) {
>  		struct cpuhp_step *step;
> 
> -- 
> 2.9.3
>