linux-kernel - Re: [PATCH] rcu: add __cpuinit to rcu_init_percpu

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Message-ID: <20090114161428.GB6734@linux.vnet.ibm.com>
Date:	Wed, 14 Jan 2009 08:14:28 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu: add __cpuinit to rcu_init_percpu_data()

On Wed, Jan 14, 2009 at 02:58:15PM +0800, Lai Jiangshan wrote:
> 
> Impact: rcu_init_percpu_data() is not use after boot when !CONFIG_HOTPLUG_CPU
> 
> add __cpuinit to rcu_init_percpu_data(), and this function's text
> will be discarded after boot when !CONFIG_HOTPLUG_CPU.

Good catch!!!

Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
> diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
> index 490934f..bd5a900 100644
> --- a/kernel/rcuclassic.c
> +++ b/kernel/rcuclassic.c
> @@ -716,7 +716,7 @@ void rcu_check_callbacks(int cpu, int user)
>  	raise_rcu_softirq();
>  }
> 
> -static void rcu_init_percpu_data(int cpu, struct rcu_ctrlblk *rcp,
> +static void __cpuinit rcu_init_percpu_data(int cpu, struct rcu_ctrlblk *rcp,
>  						struct rcu_data *rdp)
>  {
>  	unsigned long flags;
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index f2d8638..b2fd602 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1314,7 +1314,7 @@ int rcu_needs_cpu(int cpu)
>   * access due to the fact that this CPU cannot possibly have any RCU
>   * callbacks in flight yet.
>   */
> -static void
> +static void __cpuinit
>  rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
>  {
>  	unsigned long flags;
> 
> 
> 
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