linux-kernel - Re: [Xen-devel] [PATCH 1/7] xen: import new ring macros in ring.h

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Date:   Tue, 7 Mar 2017 17:15:44 +0000
From:   Julien Grall <julien.grall@....com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org
Cc:     jgross@...e.com, linux-kernel@...r.kernel.org,
        Stefano Stabellini <stefano@...reto.com>,
        boris.ostrovsky@...cle.com
Subject: Re: [Xen-devel] [PATCH 1/7] xen: import new ring macros in ring.h

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@...reto.com>
> CC: konrad.wilk@...cle.com
> CC: boris.ostrovsky@...cle.com
> CC: jgross@...e.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