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From: David Vrabel <dvrabel@cantab.net>
To: Anna-Maria Gleixner <anna-maria@linutronix.de>,
	linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xenproject.org,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	rt@linutronix.de, David Vrabel <david.vrabel@citrix.com>
Subject: Re: [Xen-devel] [PATCH] xen: Add comment for missing FROZEN notifier transitions
Date: Wed, 6 Apr 2016 14:09:44 +0100	[thread overview]
Message-ID: <57050A98.80901@cantab.net> (raw)
In-Reply-To: <1459773140-43707-1-git-send-email-anna-maria@linutronix.de>

On 04/04/16 13:32, Anna-Maria Gleixner wrote:
> Xen guests do not offline/online CPUs during suspend/resume and
> therefore FROZEN notifier transitions are not required. Add this
> explanation as a comment in the code to get not confused why
> CPU_TASKS_FROZEN masked transitions are not considered.
> 
> Cc: David Vrabel <david.vrabel@citrix.com>
> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> Cc: xen-devel@lists.xenproject.org 
> Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
> ---
>  arch/arm/xen/enlighten.c         |    6 ++++++
>  arch/x86/xen/enlighten.c         |    7 +++++++
>  drivers/xen/events/events_fifo.c |    6 ++++++
>  3 files changed, 19 insertions(+)
> 
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -213,6 +213,12 @@ static int xen_cpu_notification(struct n
>  				unsigned long action,
>  				void *hcpu)
>  {
> +	/*
> +	 * Xen guests do not offline/online CPUs during
> +	 * suspend/resume, thus CPU_TASKS_FROZEN masked transitions
> +	 * are not considered.
> +	 */

This may not be true for arm guests.

David

  parent reply	other threads:[~2016-04-06 13:09 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-04 12:32 [PATCH] xen: Add comment for missing FROZEN notifier transitions Anna-Maria Gleixner
2016-04-04 16:21 ` Julien Grall
2016-04-04 16:21 ` [Xen-devel] " Julien Grall
2016-04-04 16:30   ` David Vrabel
2016-04-04 16:30   ` [Xen-devel] " David Vrabel
2016-04-04 16:48     ` Boris Ostrovsky
2016-04-04 16:48     ` [Xen-devel] " Boris Ostrovsky
2016-04-05  4:22       ` Juergen Gross
2016-04-06 23:52         ` Stefano Stabellini
2016-04-06 23:52         ` Stefano Stabellini
2016-04-05  4:22       ` Juergen Gross
2016-04-06 13:09 ` David Vrabel [this message]
2016-04-06 14:08   ` [PREEMPT-RT] [Xen-devel] " Anna-Maria Gleixner
2016-04-06 14:08   ` [PREEMPT-RT] " Anna-Maria Gleixner
2016-04-06 23:53   ` Stefano Stabellini
2016-04-06 23:53   ` [Xen-devel] " Stefano Stabellini
2016-04-06 13:09 ` David Vrabel

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