linux-kernel - Re: [PATCH v2] ARM: xen: only set pm function ptrs for Xen guests

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Message-ID: <CAPnVf8xczxPDucWMPcJ-Rre9uBXWAtHA0NkT62xu5ZghvpsFRg@mail.gmail.com>
Date:	Wed, 28 Aug 2013 22:22:02 +0100
From:	Julien Grall <julien.grall@...aro.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	xen-devel@...ts.xensource.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: [PATCH v2] ARM: xen: only set pm function ptrs for Xen guests

On 28 August 2013 19:20, Rob Herring <robherring2@...il.com> wrote:
> From: Rob Herring <rob.herring@...xeda.com>
>
> xen_pm_init was unconditionally setting pm_power_off and arm_pm_restart
> function pointers. This breaks multi-platform kernels. Make this
> conditional on running as a Xen guest and make it a late_initcall to
> ensure it is setup after platform code for Dom0.
>
> Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
> ---
>  arch/arm/xen/enlighten.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 8a6295c..13a7d1f 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -273,12 +273,15 @@ core_initcall(xen_guest_init);
>
>  static int __init xen_pm_init(void)
>  {
> +       if (!of_find_compatible_node(NULL, NULL, "xen,xen"))
> +               return -ENODEV;
> +

You should use the macro xen_domain() to check if we are running
in a Xen guest.

Cheers,

-- 
Julien Grall
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