Subject: Re: [Xen-devel] [PATCH 1/7] xen: import new ring macros in ring.h
To: Stefano Stabellini <sstabellini@kernel.org>,
        xen-devel@lists.xenproject.org
References: <alpine.DEB.2.10.1703061147250.17906@sstabellini-ThinkPad-X260>
 <1488830488-18506-1-git-send-email-sstabellini@kernel.org>
Cc: jgross@suse.com, linux-kernel@vger.kernel.org,
        Stefano Stabellini <stefano@aporeto.com>, boris.ostrovsky@oracle.com
From: Julien Grall <julien.grall@arm.com>
Message-ID: <1017c144-67a7-dc69-dcda-18bf90c245ab@arm.com>
Date: Tue, 7 Mar 2017 17:15:44 +0000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
 Thunderbird/45.7.0
MIME-Version: 1.0
In-Reply-To: <1488830488-18506-1-git-send-email-sstabellini@kernel.org>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 997
Lines: 35

Hi Stefano,

On 03/06/2017 08:01 PM, Stefano Stabellini wrote:
> Sync the ring.h file with upstream Xen, to introduce the new ring macros.
> They will be used by the Xen transport for 9pfs.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: konrad.wilk@oracle.com
> CC: boris.ostrovsky@oracle.com
> CC: jgross@suse.com
>
> ---
> NB: The new macros have not been committed to Xen yet. Do not apply this
> patch until they do.
> ---
> ---
>  include/xen/interface/io/ring.h | 131 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 131 insertions(+)
>
> diff --git a/include/xen/interface/io/ring.h b/include/xen/interface/io/ring.h
> index 21f4fbd..e16aa92 100644
> --- a/include/xen/interface/io/ring.h
> +++ b/include/xen/interface/io/ring.h

[...]

> +#define XEN_FLEX_RING_SIZE(order)                                             \
> +    (1UL << (order + PAGE_SHIFT - 1))

This will need to be XEN_PAGE_SHIFT in order to works with 64K kernel.

Cheers,

-- 
Julien Grall