linux-kernel - Re: [PATCH 1/3 -mm] generic-ipi: fix hotplug

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Date:	Wed, 29 Jul 2009 16:27:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	mingo@...e.hu, jens.axboe@...cle.com, nickpiggin@...oo.com.au,
	peterz@...radead.org, rusty@...tcorp.com.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3 -mm] generic-ipi: fix hotplug_cfd()

On Wed, 29 Jul 2009 15:53:13 +0800
Xiao Guangrong <xiaoguangrong@...fujitsu.com> wrote:

> Use CONFIG_HOTPLUG_CPU, not CONFIG_CPU_HOTPLUG
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  kernel/smp.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/smp.c b/kernel/smp.c
> index bf9f18b..1b5fd2e 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c
> @@ -54,7 +54,7 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
>  			return NOTIFY_BAD;
>  		break;
>  
> -#ifdef CONFIG_CPU_HOTPLUG
> +#ifdef CONFIG_HOTPLUG_CPU
>  	case CPU_UP_CANCELED:
>  	case CPU_UP_CANCELED_FROZEN:
>  

Dammit, that mistake is easy to make.  We should have used #if from day
one, not #ifdef.  Oh well.

What's the impact of this bug?  Do we think the fix should be present
in 2.6.31?  2.6.30.x?

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