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

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Message-Id: <51A5CEB402000078000D97BA@nat28.tlf.novell.com>
Date:	Wed, 29 May 2013 08:47:32 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"David Vrabel" <david.vrabel@...rix.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 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?

Jan

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