linux-kernel - Re: [PATCH v2 11/20] tty/hvc: xen: Use xen page definition

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Message-ID: <55B20AD0.8050007@citrix.com>
Date:	Fri, 24 Jul 2015 10:52:16 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<linux-arm-kernel@...ts.infradead.org>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 11/20] tty/hvc: xen: Use xen page definition

On 09/07/15 21:42, Julien Grall wrote:
> The console ring is always based on the page granularity of Xen.
[...]
> --- a/drivers/tty/hvc/hvc_xen.c
> +++ b/drivers/tty/hvc/hvc_xen.c
> @@ -392,7 +392,7 @@ static int xencons_connect_backend(struct xenbus_device *dev,
>  	if (xen_pv_domain())
>  		mfn = virt_to_mfn(info->intf);
>  	else
> -		mfn = __pa(info->intf) >> PAGE_SHIFT;
> +		mfn = __pa(info->intf) >> XEN_PAGE_SHIFT;

Change this to

gfn = xen_page_to_gfn(virt_to_page(info->intf));

and drop the if()?

David
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