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Date: Wed, 6 Dec 2006 08:12:01 -0800
From: Andrew Morton <akpm@osdl.org>
To: Prarit Bhargava <prarit@redhat.com>
Cc: linux-kernel@vger.kernel.org, davej@redhat.com
Subject: Re: [PATCH]: cpu hotplug locking fix
Message-Id: <20061206081201.9fafe733.akpm@osdl.org>
In-Reply-To: <20061206160429.6419.27617.sendpatchset@prarit.boston.redhat.com>
References: <20061206160429.6419.27617.sendpatchset@prarit.boston.redhat.com>
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On Wed, 6 Dec 2006 11:04:29 -0500
Prarit Bhargava <prarit@redhat.com> wrote:

> --- linux-2.6.18.ia64/kernel/cpu.c.orig	2006-10-31 10:57:37.000000000 -0500
> +++ linux-2.6.18.ia64/kernel/cpu.c	2006-10-31 10:57:46.000000000 -0500
> @@ -58,8 +58,8 @@ void unlock_cpu_hotplug(void)
>  		recursive_depth--;
>  		return;
>  	}
> -	mutex_unlock(&cpu_bitmask_lock);
>  	recursive = NULL;
> +	mutex_unlock(&cpu_bitmask_lock);
>  }

That's already in 2.6.19.