linux-kernel - Re: [Xen-devel] [PATCH 2/2] x86/xen: sync the wallclock when the system time changes

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Message-ID: <51A5CC46.60508@citrix.com>
Date:	Wed, 29 May 2013 10:37:10 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	John Stultz <john.stultz@...aro.org>, <xen-devel@...ts.xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/2] x86/xen: sync the wallclock when the
 system time changes

On 29/05/13 08:47, Jan Beulich wrote:
>>>> On 28.05.13 at 20:22, David Vrabel <david.vrabel@...rix.com> wrote:
>> @@ -199,28 +201,59 @@ static void xen_get_wallclock(struct timespec *now)
>>  
>>  static int xen_set_wallclock(const struct timespec *now)
>>  {
>> -	struct xen_platform_op op;
>> -	int ret;
>> -
>>  	/* do nothing for domU */
>>  	if (!xen_initial_domain())
>>  		return -1;
>>  
>> -	/* Set the Xen wallclock. */
>> +	/* Set the hardware RTC. */
>> +	return mach_set_rtc_mmss(now);
>> +
>> +}
> 
> Can't you achieve the same effect in a cleaner way by overriding
> x86_platform.set_wallclock only in the non-init-domain case?

Yes, that makes sense.  John, don't apply this one yet, thanks.

David
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