From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH v2] x86: Fixup IRQs when CPUs go down during
	shutdown
Date: Wed, 2 Dec 2015 13:53:41 +0000
Message-ID: <565EF7E5.9020305@citrix.com>
References: <1449063981-31486-1-git-send-email-ross.lagerwall@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1449063981-31486-1-git-send-email-ross.lagerwall@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Ross Lagerwall <ross.lagerwall@citrix.com>, xen-devel@lists.xen.org
Cc: Jan Beulich <jbeulich@suse.com>
List-Id: xen-devel@lists.xenproject.org

On 02/12/15 13:46, Ross Lagerwall wrote:
> @@ -298,6 +299,13 @@ static void stop_this_cpu(void *dummy)
>  void smp_send_stop(void)
>  {
>      int timeout = 10;
> +    cpumask_t online;
> +
> +    cpumask_clear(&online);
> +    cpumask_set_cpu(smp_processor_id(), &online);

You can avoid this intermediate variable with cpumask_of(smp_processor_id())

There are a set of pre-canned cpumasks with a single cpu set.

~Andrew