linux-kernel - Re: [Xen-devel] [PATCHv1] x86: rtc_cmos platform device requires legacy irqs

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Date:	Fri, 4 Dec 2015 15:24:35 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	David Vrabel <david.vrabel@...rix.com>, <x86@...nel.org>
CC:	<linux-kernel@...r.kernel.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCHv1] x86: rtc_cmos platform device requires
 legacy irqs

On 04/12/15 14:06, David Vrabel wrote:
> On 03/12/15 10:43, David Vrabel wrote:
>> Adding the rtc platform device when there are no legacy irqs (no
>> legacy PIC) causes a conflict with other devices that end up using the
>> same irq number.
> 
> An alternative is to remove the rtc_cmos platform device in Xen PV
> guests.
> 
> Any preference on how this regression should be fixed?
> 
> David
> 
> 8<--------------------------
> x86: Xen PV guests don't have the rtc_cmos platform device
> 
[...]
> --- a/arch/x86/kernel/rtc.c
> +++ b/arch/x86/kernel/rtc.c
> @@ -200,6 +200,9 @@ static __init int add_rtc_cmos(void)
>  	}
>  #endif
>  
> +	if (xen_pv_domain())
> +		return -ENODEV;
> +

Note there's a missing include that breaks !XEN builds.

David
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